Michel is twice as old as his sister sylvia. In four years three times Micheal's age is equvialent to five times of sylvia's age. How old is Micheal now
perhaps it means (although the statement is ambiguous)
3(2 s + 4) = 5(s+4)
6 s +12 = 5 s + 20
s = 8
m = 2 s = 16