- #1

- 52

- 11

- Homework Statement
- When asked her age, Miss Grundy refused to tell. After being begged for a hint she finally admitted that in 12 years she hoped to be three times as old as she was 72 years ago.

Write and solve an equation for this.

How old was she 72 years ago?

How old is she now?

- Relevant Equations
- None.

I haven't gotten to multiple variables yet in algebra, but I tried to solve it this way. x - 12 = 3y -72 with y = - 12 + x

Then I multiply 3x - 36 -72 = 3x -108

Next step is +108 to both sides to get 3x= 108, and then x = 36

So she was 36 72 years ago and is 96 now.

The math seems to checkout but I'm unsure.

Then I multiply 3x - 36 -72 = 3x -108

Next step is +108 to both sides to get 3x= 108, and then x = 36

So she was 36 72 years ago and is 96 now.

The math seems to checkout but I'm unsure.