Hi,

Mary is four times as old as John's age 

The difference of their age is 42.

 Mary - John = 42

*** 4x - x = 42

    3x = 42

    x 14, John's age.   Mary is 56.    

CHECKING our answer***

56-14 = 42

Wish You the Best in your Studies.

 

Answer by edjones(8007)   (Show Source): You can put this solution on YOUR website!
 m=4j

m-j=42

.

4j-j=42

3j=42

j=14

m=56

.

Ed 

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