If 18 dolls cost Rs 630,

Question:

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

Solution:

Let the required number of dolls be x. Then, we have:
 

 No of dolls 18 x
Cost of dolls (in rupees) 630 455

Clearly, the less the amount of money, the less will be the number of dolls bought.

So, this is a case of direct proportion.

Now, $\frac{18}{630}=\frac{x}{455}$

$\Rightarrow \frac{1}{35}=\frac{x}{455}$

$\Rightarrow x=\frac{455}{35}$

$\Rightarrow x=13$

 

Therefore, 13 dolls can be bought for Rs 455.

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