A is 4 years older than B. After 5 years, the sum of their ages will be 50. Find B's present age.
18 years
Let B's present age be x years. Then A's present age is (x + 4) years.
After 5 years their ages are (x + 5) and (x + 9), and their sum is 50.
(x + 5) + (x + 9) = 50, so 2x + 14 = 50 and 2x = 36.
x = 18.
Hence, the answer is 18 years.
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