Question

using direct and indricet method".
if 6 note book cost is 156 find the cost of 154 notebooks​

Answer 1

Solution :-

6 note books costs = 156 Rs

154 note books costs = ?

Let us suppose the cost of 154 notebooks be Rs x

The number of note books and its cost are in direct proportion .

$\dfrac{6}{156} = \dfrac{154}{x} \\ \\ \: \: \: \: \: \: \: \: \: x = \dfrac{154 \times 156}{6} \\ \\ x = \dfrac{24024}{6} \\ \: \: \ \: \\ \: \: \: \: \: \: \: \: \: \: \: x = 4004 \: rupees$

Hence , the cost of 154 note books is 4004 Rs.

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There are 2 types of proportions

• Direct proportion
• Indirect proportion

What is Direct proportion ?

In a proportion , where one thing increases and the other thing increases too is called as Direct proportion .

Example :-

The price of 1 chocolate is 10 Rs and the price of 10 chocolate is 100 Rs

Here , the quantity of chocolates has increased and the Price of the chocolates has increased too.

Such a proportion is called Direct Proportion .

What is Indirect Proportion ?

In a proportion , when one thing increases and the other thing decreases is called as Indirect proportion .

Example :-

2 workes take 10 days to do a work and 4 workers take 5 days to do the same work

Here , the number of workers has increased and the days ( time ) taken to do the work has decreased.

Such a proportion is called Indirect Proportion .