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Question 323945: A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?
solution:
Speed= 60X5/18 m/sec = 50/3m/sec
length of the train = S X D = 50/3 X 9m = 150m
when do we use 5/18 ?
Click here to see answer by mananth(12270)

Question 324102: a student has earned scores of 80, 81, and 82 on the first 3 of 4 tests. if the student wants an average (arithmetic mean) of exactly 85, what score must she earn on the forth test?
Click here to see answer by maciaemi(11)

Question 324327: Can you give me a detailed explanation of how to solve 3-8x=1 ?
Click here to see answer by Fombitz(13828)

Question 324327: Can you give me a detailed explanation of how to solve 3-8x=1 ?
Click here to see answer by jessica43(140)

Question 324350: The average (arithmetic mean) of x and y is 20. If z = 5, what is the average of x, y, and z?
Click here to see answer by Fombitz(13828)

Question 324306: If the average (arithmetic mean) of seven numbers is -8 and the average of five of the numbers is 6, what is the average of the other two numbers?
(A) -43 (B) -30 (C) -14 (D) -13 (E) -6

Click here to see answer by Fombitz(13828)

Question 324581: i dont understand how the answer is 30 and i get 20 or 12
Ben is making wooden toys for the next arts and crafts sale. Each toy costs Ben $1.80 to make. If he sells the toys for $3.00 each, how many will he have to sell to make a profit of exactly $36.00 ?
A. 12
B. 20
C. 30
D. 60
E. 108

Click here to see answer by Fombitz(13828)

Question 324701: Given 15 data items: 11, 15, 13, 16, 8, 8, 9, 10, 11, 4, 9, 6, 8, 3, 17 Calculate the: The mean, The median, and The mode.
Click here to see answer by JBarnum(2044)

Question 324916: Martin’s average (arithmetic mean) score after 4 tests is 89. What score on the 5th test would bring Martin’s average up to exactly 90?
(A) 90 (B) 91 (C) 92 (D) 93 (E) 94

Click here to see answer by vleith(2825)

Question 324943: The average age of all the students of a class is 18.0 years. The average age of boys of the class is 20 years and that of the girls is 15 years. If the number of girls in the class is 20, then find the number of boys in the class?
Click here to see answer by Fombitz(13828)

Question 325095: His test scores were 80, 88, 71, and 75. After his next test he found his average to be 78. What did he score on his fifth exam?
Click here to see answer by rfer(12654)

Question 325309: Martin's average score after 4 tests is 89. What score on the 5th test would bring Martin's average up to exactly 90?
Click here to see answer by stanbon(57278)

Question 325343: Sam has scored 14 ,20, 22, and 16 points in 4 basket ball games how many points must he score in the 5th game .if the average is to be 20 ?
A 32 B 28 C 24 D 22 E 20
Click here to see answer by AAfter Search(61)

Question 325369: On a recent quiz 6 students received course averaging 92 . The remaining students in the class received scores averaging 89 .if the quiz grades for the entire class averaged 90 .how many students were in the class ?

Click here to see answer by checkley77(12569)

Question 325577: the arithmetic mean of five numbers is 60. if the arithmetic mean of the first four numbers is 70, what is the fifth number?
Click here to see answer by mananth(12270)

Question 325669: A boy cycles x km at y km per hour and p km at q km per hour.Find his average speed for the whole journey.
Click here to see answer by mananth(12270)

Question 326175: four empty trucks are on a bridge that has a maximum capacity of 30,000 pounds. If the average (arithmetic mean) weight of three of the trucks is 7,800 pounds, what is the greatest possible safe weight of the fourth truck?
Click here to see answer by checkley77(12569)

Question 326183: if the average of three different positive integers is 70 what is the greatest possible value of one of the integers?
Click here to see answer by stanbon(57278)

Question 326192: If a, b, c represent three numbers where b = a + 3 and c = b + 6,
what is the result when the median of the three numbers is subtracted from the average of the numbers?
Click here to see answer by solver91311(16872)

Question 326618: If the area of the room is 9x2 − 6x + 1 square feet, what is the length of one side of the room?
Click here to see answer by Alan3354(30993)

Question 326734: Charlie has scores of 88, 95, and 89 on the first three tests. What score must he make on the fourth test so that the average of all four tests is exactly 93?
a.91.25 b.93 c.95 1/3 d.97 e.100

Click here to see answer by AAfter Search(61)

Question 326732: A reflex angle between the hands of a clock at 10.25 is?
Click here to see answer by mananth(12270)

Question 327225: determine if the given number is a solution to the equation
6, -x+12=6
Click here to see answer by solver91311(16872)

Question 327231: An aluminum plate is made according to the following dimensions. The outer radius is 12 inches and the inner radius is 5 inches. Use  = 3.14 as an approximate value. (a) How many square inches in area is the aluminum plate? (b) If the cost to construct the plate is $5.50 per square inch, what is the construction cost?
Click here to see answer by solver91311(16872)

Question 327395: The average weight of 10 children is 88 pounds. Two more children join the group: one weighs 95 pounds and the other 93 pounds. What is the average weight for the twelve children?
a. 89 pounds
b. 90 pounds
c. 91 pounds
d. 92 pounds
e. 93 pounds

Click here to see answer by stanbon(57278)

Question 327588: Six hundred people attended the premiere of a motion picture.Adult tickets costs $5 each and children were admitted for $2 each.If the box office receipts totaled $2400; how many children attended
Click here to see answer by ganeshindia(11)

Question 327602: Three hundred people attended the premiere of a motion picture. Adult tickets costs $10 each and children were admitted for $6 each. If the box office receipts totaled $ 1200; how many children attended?
Click here to see answer by Fombitz(13828)

Question 327650: The average weight of 10 children is 88 pounds. Two more children join the group: one weighs 95 pounds and the other 93 pounds. What is the average weight for the twelve children?
a. 89 pounds
b. 90 pounds
c. 91 pounds
d. 92 pounds
e. 93 pounds
Click here to see answer by ankor@dixie-net.com(15645)

Question 327984: Martin’s average (arithmetic mean) score after 4 tests is 89. What score on the 5th test would bring Martin’s average up to exactly 90?
(A) 90 (B) 91 (C) 92 (D) 93 (E) 94

Click here to see answer by mananth(12270)

Question 328054: In a science test a class of 30 students had an average of 80. The 20 girls had an average of 85. Whats the average of the 10 remaining boys?
Click here to see answer by ankor@dixie-net.com(15645)

Question 328184: Please help me with this: -3/5[2/3-1/2(3/4-1/2)]=
I keep coming up with -1/40 as the answer but the answer sheet says -13/40.
I did the order of operation first then every other way thinkable and keep coming up with the wrong answer.
Click here to see answer by Fombitz(13828)

Question 328344: The average of six daily high temperatures is 58˚ Fahrenheit. If two of the temperatures were 48˚ and 32˚, what was the average of the other four temperatures?

Click here to see answer by mananth(12270)

Question 328400: I dropped out of school in the seventh grade and i am currently taking my GED i have sucessfully finished all but my math test. my instructor says i need to get a grip on the begging in algebra. i dont know anything about algbra i mean nothing how can i start to learn. I am desprite.
Click here to see answer by Alan3354(30993)

Question 328741: Your average score on four exams is 82. If your professor drops the lowest exam score then your average will be 86. What was the lowest score?
Click here to see answer by Fombitz(13828)

Question 328773: A secretary typed 59 words per minute for 59 minutes, 42 words per minutes for 42 minutes and 73 words per minute for a 100 minutes. What was the average rate of her typing speed in words per minute for this time?
Click here to see answer by Theo(3458)

Question 329029: If the average of 3, 8 and x is equal to the average of 7 and x, what is the value of x?
Click here to see answer by mananth(12270)

Question 329398: A student’s mean score after 4 quizzes was 72. After the fifth quiz, the mean increased to 75.What was the student’s score on the fifth quiz?
(A) 60 (B) 72 (C) 84 (D) 87 (E) 100
Click here to see answer by stanbon(57278)

Question 329579: what is the average of these three numbars.... 5392, 8321, 37818?
Click here to see answer by privani(34)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330