# Questions on Algebra: Divisibility and Prime Numbers answered by real tutors!

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 Algebra: Divisibility and Prime Numbers Solvers Lessons Answers archive Quiz In Depth

 Question 12882: what is the smallest number that is divisible dy four different primes?Why or why not? Click here to see answer by 303795(595)

 Question 15240: find 3 consecutive multiples of 5 whose sum is 60 Click here to see answer by 303795(595)

 Question 15241: find 3 consecutive multiples of 5 whose sum is 60 Click here to see answer by 303795(595)

 Question 67208: on the 1st day 2721 entered the contset. four times that many entered the contest the 2nd day. only 977 entered the contest on the third day. how many entered the contest in all? Click here to see answer by cassiroberts(11)

 Question 67970: I basicly need help with everything... I can't afford a tutor... I am getting soo tired of going over the same things and not remembering how to do them... like product of prime and all that stuff... can you help?? I am doing Pre algebra, in the blue saxon book... Thanks.... Click here to see answer by tutorcecilia(2152)

 Question 69113: How do u factorize 82 into its primes? Click here to see answer by stanbon(57348)

 Question 69354: What are the four odd digit numbers that have a sum of eight? Click here to see answer by checkley75(3666)

 Question 69540: Is it false of true that every composite number has more factors than multiples? Click here to see answer by tanimachatterjee(60)

 Question 69569: Im working On Prime Factorization: If someone help me 2 figure out the "PF" for 163 It would be greatly appreciated:) Thank You Click here to see answer by funmath(2925)

 Question 69979: I am trying to find the correct process to work this problem out. One that shows step by step and how each step was retrieved. 6x -1 / 5 - 2x/3 = 3 / means divide. Thanks Kathy Click here to see answer by jim_thompson5910(28595)

 Question 75181: Find digits a and b such that the number 34a47b5893 is divisible by 99. Click here to see answer by nilan(15)

 Question 78172: I am having trouble with a question from my school text book and I have asked my teacher but I am still confused. The question is list two numbers with a HCF of 12 and a LCM of 180. I have asked my mum and and she doesn't get it. She checked in the awnsers fo me but that didn't help either. So can you please show me step by step workings to solve this problem. Thank you. Click here to see answer by checkley75(3666)
 Question 78172: I am having trouble with a question from my school text book and I have asked my teacher but I am still confused. The question is list two numbers with a HCF of 12 and a LCM of 180. I have asked my mum and and she doesn't get it. She checked in the awnsers fo me but that didn't help either. So can you please show me step by step workings to solve this problem. Thank you. Click here to see answer by jim_thompson5910(28595)

 Question 80336: find all the factors of 48 then classify 48 as primee or composite Click here to see answer by jim_thompson5910(28595)

 Question 80802: The following nine digit number has its units digit ereased: 25478016__. test for divisiblity are required. if the # is divisible by 3 list all possible units digits for the number. if the # is divisible by 9 list all possible units digits for the number. if the # is divisible by 8 list all possible units digits for the number. if the # is divisible by 12 list all possible units digits for the number. Click here to see answer by stanbon(57348)
 Question 80802: The following nine digit number has its units digit ereased: 25478016__. test for divisiblity are required. if the # is divisible by 3 list all possible units digits for the number. if the # is divisible by 9 list all possible units digits for the number. if the # is divisible by 8 list all possible units digits for the number. if the # is divisible by 12 list all possible units digits for the number. Click here to see answer by Edwin McCravy(8909)

 Question 83002: I need to find the GCF for 14 and 21. Is the answer 21? Click here to see answer by jim_thompson5910(28595)

 Question 84158: The Prime numbers between successive gaps of ten numbers are: 2, 3, 5, and 7. 11, 13, 17, and 19. 23 and 29. 31 and 37. 41, 43, 47, and (not 49 - square of 7) 53 and 59. 61 and 67. 71, 73, and 79 and (not 77) 83 and 89. 91 and 97. Can you see a pattern forming? Despite of this I was not able to formulate a simple and general expression so that I could tell whether or not a number is prime by simply looking at the number and applying the above sequence. Can you help? Please! I am very excited about this project. It is my own thought and has not been assigned to me as a homework. Thankyou. Click here to see answer by rapaljer(4667)

 Question 86658: find the GCF by prime factorization 61. 64, 160, and 224 Click here to see answer by checkley75(3666)

 Question 86742: I need help with the following problem. Someone spilled ink on a bill for 36 sweatshirts. If only the first and last digits were covered and the other three digits were, in order, 8, 3, 9 as in ?83.9?, how much did each cost? I do not have a clue how to do this problem. Please help. Thank you for your time, it is appreciated. Sincerely, R. Franke Click here to see answer by Edwin McCravy(8909)
 Question 86742: I need help with the following problem. Someone spilled ink on a bill for 36 sweatshirts. If only the first and last digits were covered and the other three digits were, in order, 8, 3, 9 as in ?83.9?, how much did each cost? I do not have a clue how to do this problem. Please help. Thank you for your time, it is appreciated. Sincerely, R. Franke Click here to see answer by ankor@dixie-net.com(15652)

 Question 86869: I need help with this problem. The problem states: Two digits of this number were erased: 273*49*5. However we know that 9 and 11 divide the number. What is it? What I have done so far: 2+7+3+*+4+9+*+5 = 30+*+* The only number divisible by both 9 and 11 is 99. However, to make the sum of this number equal 99 the two missing digits would have to be 35 and 34. Would these numbers be correct? I have tried other single digit numbers and haven't found a sum divided by both 9 and 11. Your help would be appreciated. Thanks. Sincerely R. Franke Click here to see answer by ankor@dixie-net.com(15652)

 Question 86740: I need help with this problem. The problem states: Two digits of this number were erased: 273*49*5. However we know that 9 and 11 divide the number. What is it? What I have done so far: 2+7+3+*+4+9+*+5 = 30+*+* The only number divisible by both 9 and 11 is 99. However, to make the sum of this number equal 99 the two digits would have to be 35 and 34. I am not sure if these numbers qualify? I tried other single numbers and haven't found a sum divided by both 9 and 11. Your help would be most appreciated. Thanks. Sincerely, R. Franke Click here to see answer by scott8148(6628)

 Question 88232: Hi there, I have to express my answer in simplest form after adding this problem. The problem reads like this: 6/3x-2 + 3/2x. I'm not even really sure what to do, so any help you can give me would be greatly appreciated! Thank you so much!! Click here to see answer by longjonsilver(2297)

 Question 90999: Express the decimal number4693 as a binary number. Click here to see answer by stanbon(57348)

 Question 90997: Find two numbers that, if multiplied, would generate a 400-digit number. Click here to see answer by checkley75(3666)

 Question 91315: Can not find what it is, but here goes dividing rational expression to its lowest terms 7x/4wx * 5x/12w Click here to see answer by chitra(359)

 Question 91457: Find two factors of 15 with a difference of 2. Click here to see answer by checkley71(8403)

 Question 91913: Find the GFC 60. (6y to the power of 2 - 3y)( y + 7) Click here to see answer by funmath(2925)