Ravi arrived at the bus stop 20 minutes early ( - 20 ). The bus was 10 minutes late ( + 10 ). How long did he have to wait ?
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Answer:
see first rule - += -- right ......
Explanation:
then ,the bus arrived 10 minutes later =(+10)
he arrived 20 minutes early =(--20) =
10--20=10
hence ,he has to wate for 10 minutes ...
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