"The divisibility rule of 3 states that if the sum of the digits of a whole number is a multiple of 3, then the original number is also divisible by 3"
So let's do as it says. 2 + 5 + 3 + 6 + 9 + 7 + 7 + 0 = 39. 39/3 = 13.
Because the sum is divisible by three, the original number is also divisible by three because of the magics of math.
Ab+ac=a(b+c) where a is the greatest common factor find greatest common factor of 10 and 50 10=1,2,5,10 50=1,2,5,10,25,50 greatest common is 10 a=10 10(1)+10(5)=10(1+5)=10(6)=60
