If the cost of 3 books is Rs.90, then find the cost of 12 books.

If Mani buys 5kg of potatoes for Rs.75 then he can buy ______kg of potatoes for Rs.105.

35 cycles were produced in 5 days by a company then______ cycles will be produced in 21 days.

Suppose 3 kg. of sugar is used to prepare sweets for 50 members, then ____ kg. of sugar is required for 150 members.

4 typists are employed to complete a work in 12 days. If two more typists are added, they will finish the same work in _______ days.

A car travels 60 km with 3 liters of petrol. If the car has to cover the distance of 200 km, it requires _______ liters of petrol.

If 7 m cloth costs Rs 294, then the cost of 5 m of cloth is ______.

If a machine in a cool drinks factory fills 600 bottles in 5 hrs, then it will fill ______ bottles in 3 hours.

16 taps can fill a petrol tank in 18 minutes. The time taken for 9 taps to fill the same tank will be _______ minutes.

If 40 workers can do a project work in 8 days, then_______ workers can do it in 4 days.

Distance travelled by a bus and time taken are in direct proportion.

Expenditure of a family to number of members of the family are in direct proportion.

Number of students in a hostel and consumption of food are not in direct proportion.

If Mallika walks 1 km in 20 minutes, then she can cover 3 km in 1 hour.

If 12 men can dig a pond in 8 days, then 18 men can digit in 6 days.