Question

if 20 pencils cost 90 /- , then the cost of 9 pencils. is?
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Answer 1

Using unitary method, we can find out the answer.

Cost of 20 pencils = 90 /-
Cost of 1 pencil = 90/20 = 4.5 /-
Now multiply the cost of one pencil with 9 pencils.

Cost of 9 pencils = 4.5 * 9 = 40.5 /-

Answer 2

Answer:

40.5

Step-by-step explanation:

20---- rupees 90

1 ---- ?

divide 90 by 20 so that we can get the price of a single pen

$90 \div 20 = 4.5$

one pen cost rupees 4.5

multiply 4.5 to 9 to get the cost of those 9 pens

$9 \times 4.5 = 40.5$

so the required answer is 40.5