The ratio of present ages of Shankar and Mohan is 7: 8 respectively. Four year hence this ratio becomes 9: 10 respectively. What is Shankar’s present age in years?

A sum of money at compound interest doubles itself in 15 years. It will become eight times of itself in

The marked price of a T.V. is ₹16,000. After two successive discounts it is sold for ₹11,400. If the first discount is 5%, then the rate of second discount is 

Direction: Study the following table carefully and answer the given questions. Table shows the of passed students in four schools and ratio between passed boys and girls among them. The ratio between failed boys and girls is reverse of passed ratio between them.

Find the approx average number of passed students in all the schools together.

The marked price of a Bike was Rs.22500. After allowing two successive discounts, it was sold for Rs.17595. If the second discount was 8%, then what was the first discount?

An article is sold at a discount of 20% and an additional discount of 30% is allowed on cash payment. If Vidya purchased the article by paying ₹ 2240 in cash, the marked price of the article was 

Study the following graph carefully to answer the given questions

After working for 3 days S is joined by O. If they complete the remaining work in 3 more days, in how many days can O alone complete the work?

Find the sum of 2x terms of the series ( 1² - 2² + 3² - 4² + ___ )