Question

One number is 8 times another number. The numbers are both positive and have a difference of 70. Find the numbers.

Which of the following equations could be used to solve the problem?


x - 8x = 70
8 x - x = 70
8 - x = 70
x - 8 = 70

Answer 1

10 and 80.

Answer 2

Because 10 times 8 is 80. And 80 - 10 is 70.

Answer 3

x - 8x = 70
8 x - x = 70
8 - x = 70
x - 8 = 70

Answer 4

And the second equation could be used!

Answer 5

Look:
8x-x=70
8x - x is 7x
So 7x= 70
Divide by 7 on both sides.
x = 10
So therefore one of the numbers is ten, and once you know that, you just do plus 70, so 80, and you have your answers!