#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 br
other?
1 answer:
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.
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