Answer:
37 years old.
Explanation:
2 years ago
Singh- 7s
Son- s
3 years in the future(so 5 years forward)
Singh- 7s+5
Son- s+5
7s+5 = 4(s+5)
7s+5 = 4s+20
3s = 15
s=5
2 years ago the son was 5 so Mr. Singh was 35
Now Mr. Singh is 37
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