Due to 50% increase in the price of vegetable oil, Ajoy now has to buy 4 liter less vegetable oil to keep his total expenditure on vegetable oil unchanged. If he spends ₹840 on vegetable oil, find the new price of vegetable oil per liters.
A shopkeeper mixes two variants of sugar in the ratio 2:3. The first variant costs 15 per kg, while the other costs 20 per kg. If the mixed sugar is sold at the price of 21.6 per kg then find the profit/loss percent incurred by shopkeeper.
The numbers 1 to 13 are written on 13 pieces of paper and dropped into a box. Three of them are drawn at random. What is the probability that the three pieces of paper picked have numbers that are in arithmetic progression?
Pump A can fill a tank in 20 minutes, while pump B can fill the same tank in 5 minutes. Both pumps are turned on together to fill the empty tank, but when tank became half full, pump B stops working and rest of the tank is filled by pump A only. How long it took to fill the tank?