Question

noel arranging his pictures in rows in his albums. if he puts 7 in a row thre are 4 extra pictures. if he puts 9 in a row there is none left. what is the smallest number of pictures that will allow him to do this?

Answer 1

Let N be the number of pictures.

Let x be the number of rows.

Therefore N = 7x +4 (From the first sentence).


Also, N= 9x (From the second sentence).

Answer 2

Equate .

9x= 7x+4
2x =4
x=2

Now sub this value for x into the second equation

N= 9x = 9(2) = 18.


Therefore answer is 18.