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Well if we convert 3 and 3/7 into an improper fraction,
we get
3×7=21
21+3=24
so the fraction is now 24/7
take the reciprocal of that to make it 7/24
the answer is
7/24
x-y=21 ⇒ x=y+21
x+13=2y
Substitute y+21 for x into the equation x+13=2y
So y+21+13=2y
Simplify 34=y
So Danielle is 34 years old. Plug y back in to the original equation
x-34=21
x=55
Tony is 55 years old
