9.0k views
0 votes
#4) mary, who is sixteen years old, is four times as old as her brother. how old will mary be when she is twice as old as her brother?

1 Answer

3 votes
Hi! Tricky question you've got there!

So far, we know that Mary is 16 and her brother is 4 (16 is 4 times as old as 4).

16 + x = 2(4 + x)

16 + x = 8 + 2x

x = 8

Now, this isn't finished yet.


(4 + 8) = 12

12 twice is 24, so Mary will be 24 years old.


User Giel Berkers
by
7.5k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.