Question 839861
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Hi,
Mary is four times as old as John's age {{{highlight_green(x)}}}
The difference of their age is 42.
 Mary - John = 42
*** 4x - x = 42
    3x = 42
    x 14, John's age.   Mary is 56.    {{{4*14}}}
CHECKING our answer***
56-14 = 42
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