Question by Lê Quốc Trần Anh - Discuss with MathYouLike

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06/04/2018 at 11:10

Zeus threw, on average, 12 lightning bolts per day in the month of March. During the first week in April, he averaged 15 lightning bolts per day. How many lightning bolts does Zeus need to throw per day on average for the rest of April to maintain a 12-bolt-per-day average over March and April? Express your answer to the nearest integer.

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¤« 07/04/2018 at 14:39

April has 30 days.

=> Zeus needs to throw: 30.12=360 (lightning bolts) in April.

In the first week of April, he has thrown: 15.7=105 (lightning bolts)

In the next 30-7=23 days, Zeus needs to throw: 360-105=255 (lightning bolts)

So the average is: 255:23=11.08≈

11 (lightning bolts per day).
FC Alan Walker 07/04/2018 at 04:15

April has 30 days.

=> Zeus needs to throw: 30.12=360 (lightning bolts) in April.

In the first week of April, he has thrown: 15.7=105 (lightning bolts)

In the next 30-7=23 days, Zeus needs to throw: 360-105=255 (lightning bolts)

So the average is: 255:23=11.08\(\approx\)11 (lightning bolts per day).

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