A pipe of diameter d can drain a certain water tank in 40 minutes. The time taken by a pipe of diameter 2d for doing the same job in: 

If a and b are odd numbers, then which of the following is even?

The mean of four different observations is 17.5. When a new observation whose value 20 is added, what will be the new mean?   

A, B, and C started a business. A invest 3,20,000 for 4 months and B invest 5.10,000 for 3 months and C invest 2,70,000 for 5 months. If the end of the year they get total profit of Rs. 1,24,800. Then find the share of B?

Find the shaded area in the given figure. If each circle having radius of 7cm?

(444% of 521) ÷972=?

If the instalments are paid at the end of every year, what annual payment will discharge a debt of Rs. 7,200 due in 3 years at 20% per annum simple interest?

If secθ – tanθ = 1/3 what is secθ + tanθ?