Question 661568
Mark is 60 years younger than Danielle. 3 years ago, Danielle's age was 4 times Mark's age. How old is Mark now?


Let Danielle's current age be D, and Mark's, M
Then: M = D - 60 ---- D = M + 60 ----- eq (i)


Also, D - 3 = 4(M - 3) ---- D - 3 = 4M - 12 ---- D - 4M = - 9 ---- eq (ii)


M + 60 - 4M = - 9 ------- Substituting M + 60 for D in eq (ii)
- 3M = - 69


M, or Mark's current age = {{{(- 69)/- 3}}}, or {{{highlight_green(23)}}}


You can do the check!!


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