a shop keeper buys a number of books for rs 1200 he had bought 10 or more books for the same amount each book would have cost him rs 20 less how many books did he buy
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Answer:
x=20
Step-by-step explanation:
8th
Maths
Comparing Quantities
Prices Related to Buying and Selling
A shopkeeper buys a number ...
MATHS
A shopkeeper buys a number of books for Rs. 1200. If he had bought 10 more books for the same amount each book would have cost him Rs. 20 less. How many books did he buy.
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ANSWER
Let x be no. of books
According to the question
x+10
1200
=
x
1200
−20
⇒1200[
x
1
−
x+10
1
]=20
⇒
x
1
−
x+10
1
=
60
1
⇒
x(x+10)
x+10−x
=
60
1
⇒600=x
2
+10x
=x(x+10)=600
∴x=20
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