In what ratio should a grocer mix tea of ₹ 60 per kg with tea of 65 per kg so that by selling the mixture at the rate of ₹ 68-20 per kg, he should make a profit of 10%

Salim's age is 10 years. His grandfather's age is 62 years. After how many years will his grandfather's age be five times that of Salim?

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?

How many grams of water should be mixed in 9 grams of shaving lotion having 50% alcohol content so that the alcohol content in the lotion becomes 30%?

50 grams of an alloy of gold and silver contains 80% gold by weight, how much more gold should be mixed in this metal so that the alloy contains 95% gold?

There is 40% sugar in 3 liters of sugar solution, what percentage of sugar will be in the new solution if one liter of water is added to this solution?

In the number 15!/100, which digit will be in the unit's place?

If x + 1/√x = 6 then x² + 1/x² is equal to :-