If p = cosec θ – cot θ and q = (cosec θ + cot θ)^-1 then which one of the following is correct?

The average age of three girls is 15 years if their ages are in the ratio 3 : 5 : 7, what will be the age of the youngest girl?

Shivani purchased five pens for ₹600. She sells these five pens at the rate of ₹50 per pen. What is the approximate lo percentage that Shivani incurred on selling the five pens?

What should come in place of the question mark '?' in the following number series?

6, 8, 11, 16, 23, ?

Direction : What value should come in place question mark(?) in the following questions?

4 × 5² – 3² × 7 + 6²=?+24

A single discount equivalent to two successive discounts of $$ {12{1\over 2}}{\%}$$ and 20% is

Each side of an equilateral triangle is 6 cm. Find its area.

A and B can do a piece of work in 18 days. B and C together can do it in 30 days. If A is twice as good a workman C, find in how many days B alone can do the work?