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Mathematics, 24.11.2020 05:00 DEEWILL5100

A school boy agrees with his schoolmaster that he will pay a penny for every sum he gets wrong, if he wins 3 pence for every one he gets right. After doing 20 sums he is 4 dimes down. How many did he get right?

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A school boy agrees with his schoolmaster that he will pay a penny for every sum he gets wrong, if h...
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