If '?' represents addition and '?' represents subtraction, what is the result of 7 ? 3 ? 2?

A. 8

A can do a work in 15 days, B can do it in 20 days, and C can do it in 30 days. If they work together, how long will it take to complete the work?

A. 6 DAYS
Posted in:  Time & Work -  Aptitude -  Mathematics

Select the odd group of numbers.

D. 21, 25

If 'MANGO' is coded as 'PLQJZ' and 'GRAPE' is coded as 'TQWZK', what is the code for 'APPLE'?

A. ZQKOV

If '?' represents subtraction and '?' represents multiplication, what is the result of 10 ? 4 ? 2?

D. 12