What is the number of zeros at the end of the result of 28! + 29!?

If four coins are tossed, the probability of getting two heads and two tails is

The average of five consecutive odd numbers is 61. What is the difference between the highest and lowest number?

n is a whole number which when divided by 4 gives 3 as remainder. What will be the remainder when 2n is divided by 4?

Five years ago, Viney's age was one-third of Vikas's age. Now, Viney's age is 17 years. What is Vikas's present age?

Two numbers are respectively 20% and 50% more than a third number. What is the ratio of the two numbers?

 A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that exactly three bulbs are good. 

 Since Raj was not paying attention in class, instead of multiplying M by 2/7, he divided M by 2/7. Raj’s value was 1(13/14)  more than expected value of M. What is M? 

If the numerator of a fraction is increased by 140% and the denominator is increased by 150%, the resultant fraction is 4/15. What is the original fraction?