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Deepak Bora
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The monthly pocket money of Ravi and Sanjeev are in the ratio 5 : 7. Their expenditures are in the ratio 3 : 5 . If each saves Rs.80 every month, find their monthly pocket money.

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ratio and proportion

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  1. Let the pocket money be 5x & 7x

    Expenditure = pocket money-  savings

    ∴ expenditure for ravi = 5x-80

    expenditure for sanjeev = 7x-80

    (5x-80) : (7x-80) = 3:5

    Cross multiplying

    5(5x-80) = 3(7x-80)

    25x-400 =  21x- 240

    4x = 160

    ∴ x = 40

    ∴ pocket money for Ravi = 5x = 5×40 = Rs. 200

    Sanjeev = 7x = 7 × 40 = Rs. 280

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