Tutors Answer Your Questions about Divisibility and Prime Numbers (FREE)
Question 921445: Find the LCM and HCF of 330 and 450. Buzzer A is programmed to beep every 330 seconds, while buzzer B is set for every 450 seconds. Buzzer A and B buzz together for the first time at 1.00pm. At what time is their sound heard together again?
Click here to see answer by Edwin McCravy(20054)   |
Question 895527: Jon can put his gold coins into either two groups, or three groups, or four groups, with a different primenumber of coins in each group and no coins left over in each case. Which one or more of the following could NOT be the number of gold coins Jon has?
A = 90
B = 75
C = 60
D = 45
E = 30
Click here to see answer by Edwin McCravy(20054) |
Question 938437: a certain bacteria doubles in volume every 5 minutes. at 1:00 p.m. a small amount of this bacteria is placed in a container. By 5:00 p.m. the container is filled with the bacteria. at what time was the container one-fourth full
Click here to see answer by Alan3354(69443)  |
Question 938928: How to explain this to my fifth grade daughter who hasn't had algebra yet. A rubber ball bounces exactly half the height from which it is dropped. The ball is dropped from the top of an office building that is 64 feet high. How high is the eigth bounce. Thank you. Please show howmto figure this out without algebra.
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 939292: There are 72 boys and 90 girls on the math team.
For the next math competition, Mr. Johnson would like to arrange all of the students in equal rows with only girls or only boys in each row.
What is the greatest number of students that can be in each row?
Click here to see answer by mathmate(429)  |
Question 955487: Find all the numbers less than 60 that are prime and have a remainder of 3 when they are divided by 7? Should have three answers but we only come up with two.
Prime numbers less than 60: 2,3,5,7,11,13,17,23,29,31,37,41,43,47,54,59.
17/7 = 2.43
*19/7 = 2.71 round up = 3
*23/7 = 3.28 round = 3
29/7 = 4.14
31/7 = 4.42
What are we doing wrong.
Thank you,
t2newark
Click here to see answer by josgarithmetic(39613) |
Question 955487: Find all the numbers less than 60 that are prime and have a remainder of 3 when they are divided by 7? Should have three answers but we only come up with two.
Prime numbers less than 60: 2,3,5,7,11,13,17,23,29,31,37,41,43,47,54,59.
17/7 = 2.43
*19/7 = 2.71 round up = 3
*23/7 = 3.28 round = 3
29/7 = 4.14
31/7 = 4.42
What are we doing wrong.
Thank you,
t2newark
Click here to see answer by MathTherapy(10549)  |
Question 960388: My son came home with question like this and need to know if there is a formula to solve. There is a 4 digit number. The sum of the digits is 11 and the number is divisible by 4 what is the number that could be in the ones place? then gives you three options.
Click here to see answer by Fombitz(32388)  |
Question 961059: i have one question , i would like to know , what is the rule of solving this quetion, the question is ( in one afericaon country presidential elections are held roughly every five years , if there was an election in the year 2000, when would the next four elections occur ? how do you know ? )
thansk alot
Click here to see answer by rothauserc(4718)  |
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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
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