SOLUTION: in a class, except 18 all are above 50 years.15 are below 50 years of age. How many people are there ? (a) 30 (b) 33 (c) 36 (d) none of these.

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in a class, except 18, all are above 50 years.
15 are below 50 years of age.
How many people are there ?
:
From what this says, there are 3 who are exactly 50
:
If x = no. over 50
then
total = x + 18; that's all we can say; answer is d