JohnCameron435 JohnCameron435

18-09-2015
Mathematics

contestada

Mary is x years old. How old will she be in 12 years? How old was she 2 years ago?

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itsHannah itsHannah

18-09-2015

As Mary isn't given an age, you must use algebra:

"How old will she be in 12 years?"
So this is 12 more years than her age. If her age is x:
x + 12

"How old was she two years ago?"
This is 2 years less than her age. If her age is x:
x - 2

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