Page 91 - Start Up Mathematics_4

EXERCISE 6.6

1. A train travelled 360 km in 4 hours. How much distance did it travel in one hour
assuming it travelled the same distance each hour?

2. A hospital orders 696 new blankets. The blankets will be delivered in 6 equal shipments.
How many blankets will be there in each shipment?
3. In a factory, 9,342 juice bottles are filled in 3 hours. If the same number of bottles are
filled each hour, how many bottles are filled in one hour?

4. There are 4,064 calories in 8 litres of mango ice cream. How many calories are there
in each litre of mango ice cream?

5. Jagdish earned ` 2,160 last month for mowing lawns. He charged ` 80 for every lawn
he mowed. How many lawns did Jagdish mow last month?
6. A science fair has 156 displays. There are 12 displays in each row. How many rows of
display are there at the science fair?

7. Tina works in a restaurant and earns ` 90,475 in 5 months. How much does Tina earn
every month?
8. Mr Sharma is building a boundary outside his house. He has 1,596 bricks. How many
rows of 21 bricks each can he lay for the boundary?

9. 305 children of a school have to go on a picnic. They have to go by buses in each of
which only 22 children can travel. How many buses will be needed?

10. Frame a word problem for each of the following and solve them.
(a) 2,700 ÷ 60 = ? (b) 4,970 ÷ 70 = ? (c) 416 ÷ 13 = ?

Unitary Method

The word unitary has come from the word unit which means one. In unitary method, we
first find the value of one unit and then find the value of the required number of units.

Quick Tip

• Divide when more things are given and you have to find one.
• Multiply when one thing is given and you have to find more.

Example 19: 5 buses carry 200 passengers. How many passengers can 20 buses carry?

Solution: Passengers carried by 5 buses = 200

Passengers carried by 1 bus = 200 ÷ 5 = 40
Passengers carried by 20 buses = 40 × 20 = 800
Thus, 20 buses can carry 800 passengers.

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