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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?

Solution

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?

Solution

Mary^{'} s age is : 16

Plug in to find h o w o l d w i ll M a ry b e w h e n s h e i s tw i ce a s o l d a s h er b ro t h er .

Solution steps

Translate the problem into an equation:

4 x = 16

Solve for

x, 4 x = 16 : x = 4

Find Mary's age

: 16

Mary^{'} s age is : 16

Plug in to find h o w o l d w i ll M a ry b e w h e n s h e i s tw i ce a s o l d a s h er b ro t h er .

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