Question 936380
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?
***
let x=number of years Mary will be twice as old as her brother
{{{(16+x)/(4+x)=2}}}
16+x=8+2x
x=8
16+8=24
How old will Mary be when she is twice as old as her brother? 24