the greatest common divisor of 8 and 12

There are three different natural numbers. Their sum is 1267 . When the greatest common divisor of these is the largest. Find three numbers

let m and n bel positive integers such that the fraction m/n is irreducible and the fraction 4m+3n/5m+2n is not irreducible. Find the greatest common divisor of 4m+3n and 5m+2n 

Find the number of elements is the divisor of 252

Give four different whole number so that any one of them would be a divisor of the higher neighbor of the product of the three others 

THE QUOTIENT OF DIVISION IS 35 AND  THE  REMAINDER IS 0. IF THE DIVIDEND IS INCREASED TO 1056 UNITS ,THE QUOTIENT WILL BE 57 . THE DIVISOR IS 

Thương của DIVISION LÀ 35 VÀ REMAINDER LÀ 0. NẾU CỔ TỨC LÀ GIA TĂNG ĐỐI VỚI ĐƠN VỊ 1056, THE Hàm QUOTIENT SẼ 57. THE DIVISOR LÀ

If B is not divisible by 24 and B is the greatest 5 - digit number that the sum of the sum of all digits is 21 then B = ?

FIND all the natural numbers a and b such that

the product of "largest common divisor" of (a,b) and "lowest common multiple" of (a,b) is 510510.

tricky problem