Solution:

8

Solution:

12 years

Solution:

Steps
1. Monica go from side A to B for approx 59 minutes
2. Lisa then move back to side A for 2 minutes to fool guard. Now guard will think she is coming to side A.
3. then she again move toward B :-)

Solution:

7 * ((3 / 7) + 3) = 24

Solution:

Because fish has its own scales.

Solution:

Age

Solution:

Through needle, the boy deflated the tires. which make the height of the car reduced and it easily passed through the underpass

Solution:

Answer B or C

Solution:

Because they were all married and not single.

Solution:

If you take the first letter , rest become palindrome