What is the number if it divides exactly by 13 and when you write its digits in reverse order you make a square number. (You get a square number when you multiply a number by itself - 64 is square because it is 8 times 8)
Answer: 52 or 169 these are divisible by 13 and when reversing 52, 169 =25 and 961 so, 25 and 961 are squares of 5 and 31 5^2=25 31^2=961
There's a three digit number which: If you add seven to it it divides exactly by seven; If you add eight to it it divides exactly by eight; If you add nine to it it divides exactly by nine. What is the number?
When a two digit number is multiplied by sum of its digits, the product is 715 but when the reverse of a two digit number is multiplied by sum of its digits the product obtained is 99 less. What is the sum of the digits of a number?
When you reverse the digits of the number 14 the number increases by 27, how many other two digits number increases by 27 when their digits are reversed?
