math
posted by ibrahim on .
mary's age is (2\3) that of peter's .two years ago mary's age was (1\2) of what peter's age will be in 5 years time .how old is peter now?

Let M and P be their ages now.
M = (2/3) P
M  2 = (P+5) /2
Now, rearrange the last equation.
2M  4 = P + 5
2M  P = 9
4M  2P = 18
From the first equation,
3M  2P = 0
Subtract the last equation from the one before it.
M = 18
P = 27