A can finish a work in 7 days. B can finish the same work in 9 days. The days required to finish the work by both of them together

If the successive discounts be 20%, 10% and 5%, then the single equivalent rate of discount is

• 31.6%

• 31.5%

• 31%

• 31.4%

The ratio of number of boys and girls in a school of 720 students is 7 : 5. How many girl should be admitted to make the ratio 1 : 1.

• 90%

• 120%

• 220%

• 240%

The selling price of 6 bananas is equal to the cost price of 8 bananas. Then the percentage of profit is

• 20%

• 

• 25%

• 30%

A basket contains 300 mangoes. 75 mangoes were distributed among some students. Find the percentage of mangoes left in the basket.

• 70%

• 72%

• 76%

• 75%

A man goes to a place on bicycle at speed of 16 km/hr, and comes back at lower speed. If the average speed is 6.4 km/hr in total, then the return speed (in  km/hr) is

• 10

• 8

• 6

• 4

57.

The simple interest on a certain sum of money at the rate of 5% per annum for 8 years is â‚¹ 840/-. Rate of interest for which the same amount of interest can be received on the same sum after 5 years is

• 7%

• 8%

• 9%

• 10%

If  then the value of  is

• 2

• 0

• 3

• 1

If  then  is

• 0

• 1

• 

• 2

O is the ortho-centre of Δ ABC, and if ∠BOC = 110°, then ∠BAC will be

• 110°

• 70°

• 100°

• 90°