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Jana1517
28.01.2020 •
Mathematics
8builders completed the construction of a wall with a length of 15 meters and a height of 3 meters in 7 days and 7 hours, how many days needed for 4 builders to build the same wall
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Ответ:
Time taken by 8 builders=175 hours
Fraction of the wall completed by 8 builders in 1 hour= 1/175
Fraction completed by 4 builders in 1 hour will be:
4/8*1/175
=1/350
therefore time taken for 4 builders to finish the wall will be:
350 hours
=14 days and 14 hours
Ответ:
b) is 2.2
Step-by-step explanation: