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Question

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

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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, 18630=x455135=x455x=45535x=13

Therefore, 13 dolls can be bought for Rs 455.

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