Question

This year Beth is twice as old as Adra. If x represents Adra's age now, which expression represents Beth's age one year ago?

Answer 1

2x-1

Explanation:

Adra's age now = x

Beth's age now is twice of Adra's so 2x

One year ago from now would be 2x-1

So 2x-1 represents Beth's age one year ago.

Hope this helps :)