The H.C.F. of 595 and 252 is

73) The L.C.M. of 26, 56, 104 and 182 is

74) A student was asked to divide a number by 3. But, instead of dividing it, he multiplied it by 3 and got 29.7. What was the correct answer?

75) A man covers half of his journey at 6 km/ hr and the remaining half at 3 km/ hr. His average speed is

76) The average weight of 8 boys is increased by 1.5 kg when one of the boys, who weights 65 kg, is replaced by a new boy. The weight of the new boy is