If on selling 12 notebooks a seller makes a profit equal to the selling price of 4 notebooks, what is his per cent profit?

11 friends went to a hotel and decided to pay the bill amount equally. But 10 of them could pay only ₹60 each; as a result the 11th has to pay ₹50 extra than his share. Find the amount paid by him.

The respective ratio between the present ages of Parag and Sapna is 21 : 19. Six years ago, the respective ratio between their ages was 9 : 8. How old is Lina, if her present age is 12 years less than Sapna's present age?

A sum of ₹221 is divided among X, Y and Z such that X gets ₹52 more than Y and Y gets ₹26 more than Z. The ratio of the shares of X, Y and Z respectively is

Samir drove at the speed of 45 km/h from home to a resort. Returning over the same route, he got stuck in traffic and took an hour longer, as he could drive only at 40 km/h. How many kilometres did he drive each way?

A man bought toffees at 6 for ₹1. How many toffees for ₹1 must he sell to gain 50%?

X is 3 times as fast as Y and is able to complete the work in 40 days less than Y. Then, the time in which they can complete the work together is

A vessel has 30 L of wine and 10 L of water. 4 L of mixture is taken out from the vessel and 4 L of water is added. This process is repeated one more time. The ratio of the quantity of wine left to the initial quantity of wine is

Samira, Mahira and Kiara rented a set of DVDs at a rent of ₹578. They used it for 8 h, 12 h and 14 h respectively. What is Kiara's share of rent to be paid?