Finding the value of one unit and then using it to find the value of the required number of units is known as unitary method.

**Unitary
Method**

Finding the value of one
unit and then using it to find the value of the required number of units
is known as unitary method.

**Steps involved in Unitary Method**

● Express the given problem in Mathematical statement.

● Find the value of one unit of the given item using
division.

● Find the value of the required number of the same
items using multiplication.

__Example 3.8__

Pari wants to buy 5 tennis balls from a sports shop.
If a dozen balls cost ₹180, how much should Pari pay to buy 5 balls?

By unitary method, we can solve this as follows
:

Cost of a dozen balls = ₹ 180

⇒ Cost of 12 balls = ₹ 180

Cost of 1 ball = 180/12 = ₹ 15

Cost of 5 balls = 5 × 15 = ₹ 75

Hence, Pari has to pay ₹ 75
for 5 balls.

__Example 3.9__

A heater uses 3 units of electricity in 40 minutes.
How many units does it consume in 2 hours?

**Solution**

In 40 minutes, electricity used = 3 units.

In 1 minute, electricity used = 3/40 units.

In 120 minutes (2 hours), electricity used = 3/40
× 120 = 9 units

Thus, the
heater consumed 9 units of electricity in 2 hours.

Tags : Ratio and Proportion | Term 1 Chapter 3 | 6th Maths , 6th Maths : Term 1 Unit 3 : Ratio and Proportion

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6th Maths : Term 1 Unit 3 : Ratio and Proportion : Unitary Method | Ratio and Proportion | Term 1 Chapter 3 | 6th Maths

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