Question

10 pencils cost Rs 15. Find the cost of two dozen pencils.​

Answer 1

Answer:

36 rs

Step-by-step explanation:

1 dozen =12 items(pencils)

so. 2 dozens= 2×12=24items (pencils)

cost of 1 pencil = total cost/no. of pencils

= 15/10= 1.5rs

Now cost of 2 dozen pencils i.e 24. pencils =

Cost of 1 pencil × Total no. of pencils=

1.5×24= 36 rs

Ans is 36rs

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Answer 2

Answer:

36 RUPEES

Step-by-step explanation:

This problem can be solved using UNITARY METHOD.

finding out the cost of one item from the price of many.

Given:-

Cost of 10 pencils=  15 Rupees

So, in order to find out 2 dozens of pencils we need to find out the cost of one such pencil..

We know that,

1 dozen = 12 pencils

therefore, 2 dozens= 24 pencils

The cost of 1 pencil = 15/10

= 1.5 rupees

If we found out the cost of one pencil, then its easy to find out the cost of 24 pencils, right?

cost of 24 pencils = 1.5 x 24

= 36 rupees

HENCE, THE COST OF 24 PENCILS IS 36 RUPEES.