Quantitative Aptitude - Arithmetic Ability Questions

What is the unit digit of the sum of first 111 whole numbers?

A train of length 100 m crosses another train of length 150 m, running on a parallel track in the opposite direction in 9 seconds. If the speed of trainhaving length 150 m is 40 km/hr, then what is the speed (in km/hr) of the other train?

Of the four numbers whose average is 91, the first is 3/10 times the sum of other three. The first number is:

65.The angles of elevation of an aeroplane flying vertically above the ground, as observed from the two consecutive stones, 1 km apart; are 45o and 60o. The height of the aeroplane from the ground is

Find the unit place digit in 71 x 72 x 73 x 74 x 76 x 77 x 78 x 79.

If P/Q = R/S = T/U = 3/4 is (4P + 5R + 7T) : (3Q + 4S + 7U)?

Ram Naresh got two successive discounts, a bag with a list price of Rs.400 is available at Rs. 160. If the second discount is 20%, find the first discount.

A number is divided by 52, we get 27 as remainder. On dividing the same number by 13, what will be the remainder?