How many times in a day are the hands of a clock pointing opposite to each other?

Radha is twice as old as Rita was 2 years ago. If difference between their ages is 2 years, how old is Radha today?

If it is Saturday on January 1, 2000, then January 1, 2001 would have been

If 9 × 3 + 8 = 24, 10 × 2 + 7 = 35 and 80 × 40 + 3 = 6, then find the value of  12 × 4 + 3 = ?