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Q.

If 18 dolls cost Rs.630, how many dolls can be bought for Rs.455?

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a

16 dolls

b

13 dolls

c

14 dolls

d

12 dolls

answer is B.

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Detailed Solution

Given,
Number of dolls bought for Rs.630 =18.
Let the number of dolls bought for Rs. 455 be x dolls.
Then,

Number of dolls	18	x
Cost of dolls (in Rs.)	630	455

We can clearly observe that, the less the amount of money the less will be the number of dolls bought.
Therefore, this is the case of direct proportion.
As this is the case of direct proportion, therefore the ratio will remain constant throughout the table that is,

18630 = x 455

Cross multiplying,

630 × x = 455 × 18

Solving for x,

x = 455 × 18 630 x = 13

Hence, number of dolls bought for Rs.455

= 13 dolls

.
Therefore, option 2 is correct.

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