Refer the below data table and answer the following question.

How many students have scored marks 20 or more but less than 40?

Refer the below data table and answer the following question.

What is the ratio of boys to girls ?

If cosAcotA/(1 -­ sinA) = x, then the value of x is

If sin(A/2) = x, then the value of x is

If tan ­-5π/3 = x, then the value of x is

When a discount of 20% is given on a monthly train pass, the profit is 44%. If the discount is 29%, then the profit is _____.

The total surface area of a hemisphere is 166.32 sq cm, find its curved surface area?

P and Q can do a project in 60 and 30 days respectively. In how many days can they complete 90% of the project if they work together?