A person covers a certain distance by car at a speed of 30 km/h and comes back at a speed of 40 km/h. The average speed during the travel is:

A person spends \(\frac{1}{3}\) part of his income on food, \(\frac{1}{4}\) part on house rent and remaining Rs. 630 on other items. The house rent is:

An employer reduces the number of employees in the ratio 8:5 and increases their wages in the ratio 7:9. Therefore, the overall wages bill is:

There are 30 boys and 40 girls in a class. If the average age of boys is 10 yrs and average age of girls is 8 yr, then the average age of the whole class is:

Father is 3 years older than the mother and the mother's age is now twice the daughter's age. If the daughter is 20 years old now, then the father's age when the daughter was born is:

The Least Common Multiple (L.C.M) of 0.12, 9.60, 0.60 is:

If 80% of A = 20% of B and B = 5x% of A, then the value of x is:

Value of "A" in the expression, 5 + 12 × 10 ÷ 120 = A × 10, is:

A mixture of 40 L of alcohol and water contains 10% water. How much water should be added to this mixture, so that the new mixture contains 20% water?