Question

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? explained

Answer 1

First, you find the brother's age by dividing mary's age by 4.
16 ÷ 4 = 4
Now that you have two ages, you can just make a list to find the answer.
16 and 4
18 and 6
20 and 8
22 and 10
24 and 12