1. Cost of 25 pencils and 20 sharpeners is Rs. 100. If the cost of a sharpener is more than the cost of a pencil by 50 paise; what is the total cost of 3 pencils and 4 sharpeners?






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  • By: anil on 05 May 2019 01.33 am
    Let the cost of 1 pencil be Rs. a
    Cost of 1 sharpener be Rs. b
    Given that
    25a+ 20b = 100
    5a + 4b = 20
    And b = a + 0.5
    5a + 4(a + 0.5) = 20
    9a = 18
    a = 2
    b = 2.5
    Cost pf 3 pencils and 4 sharpeners = 3a + 4b = Rs. 16
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