Question

If n is an integer between 20 and 80 , then any of the following could be n+7 except

Answer 1

If n is an integer between 10 and 90,is n <80

1. The sum of two digits of n prime is a prime number.

2. each if the two digits of n is a prime number.

I know this must be easy the answer is B (statement 2 is sufficient alone , while statement 1 is not ).

Answer 2

Answer:

n should be greater than 20 and less than 80

so if n is 19 it's not possible or n is 81 also not possible

88 is the answer because n+7=88 then n=81 so 81 is greater than 80 so it's the answer