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James is 4 years older than Paul. In two years their ages will total 50 how old is James now ?
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J = P +4 (1) ("James is 4 years older than paul.")
(J+2) + (P + 2) = 50. (2) ("In two years their ages will total 50")
Substitute (1) into (2). You will get
((P+4)+2)) + (P+2) = 50,
2P + 8 = 50,
2P = 50 - 8 = 42,
P = = 21.
Answer. Paul is 21. James is 25.
