Question 758953
A certain number of persons promised to subscribe equally to a girft of $600, five of them failed to keep their promise, and each of the other increased his subscription by $10. The exact amount required was obtained. How many persons suscribed. 
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Let the original # of people be "x.
Average contribution would be 600/x dollars.
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New # of people is (x-5).
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Contribution from x-5 people = $10
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Equation:
(x-5)(x/600 + 10) = 600
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(x-5)(x+6000)/600 = 600
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(x-5)(x+6000) = 360000
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x^2 + 6000x-5x-30000 = 360000
x^2 + 5995x = 390000
x^2 + 5995x - 390000 = 0
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x = 64.36...
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Note: That doesn't look right.
The answer should be a whole number.
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Cheers,
Stan H.
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