Multiple Choice Questions on There are 90 coins comprising of 5 and 10 paisa coins The value of all the coins is Rs 7 How many 5 ........... for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

There are 90 coins comprising of 5 and 10 paisa coins The value of all the coins is Rs 7 How many 5 ...........

Quantitative Aptitude (RRB NTPC) Number System
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    There are 90 coins, comprising of 5 and 10 paisa coins. The value of all the coins is Rs. 7. How many 5 paisa coins are there? 

    50

    Incorrect Answer

    45

    Incorrect Answer

    40

    Correct Answer

    35

    Incorrect Answer
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    Explanation:
    Let 5 paise coin = x
    Let 10 paise coin = (90 – x)
    Atq,
    7 × 100 = 5x + 10 (90 – x)
    700 = 5x + 900 – 10x
    x = 40
    ∴ 5 paise coin = 40 coins
     
     

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