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UPSC Prelims

Mathematics

Theme:

Statistics / सांख्यिकी

Q19 2019, Statistics

Rakesh and Rajesh together bought 10 balls and 10 rackets. Rakesh spent 1300 and Rajesh spent 1500. If each racket costs three times a ball does, then what is the price of a racket?

राकेश और राजेश ने एक साथ मिल कर 10 गेंदें और 10 रैकेट खरीदे। राकेश ने ₹1300 खर्च किए और राजेश ने ₹1500 खर्च किए। यदि प्रत्येक रैकेट की क़ीमत एक गेंद की क़ीमत की तीन गुनी है, तो एक रैकेट की क़ीमत क्या है ?

Explanation Please wait..

• Let the cost of each ball is Rs. X. Then cost of each racket will be 3X.

• Cost of 10 balls = 10X, and cost of 10 rackets = 30X.

• So total cost = 10X + 30X = 40X.

• By the condition given in question, we have

• 40X = 1300 + 1500 or 40X = 2800 or X = 70. Price of each racket = Rs. 210.

व्याख्या Please wait..

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