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71887
24.11.2020 •
Mathematics
A biker can ride a bicycle 18 miles in 3 hours. the messenger estimates that it will take 7 hours to bike 22 miles. here is the messengers work:
step 1: 22-18=4
step 2: 3+4=7
what mistake did the messenger make?
• the messenger did not make a mistake. the estimate is correct
• the 3 and 4 should have been multiplied instead of added.
• the messenger used addition and Subtraction instead of multiplication and division
• the 22 and 18 should have been divided instead of subtracted
• the 22 and 18 should have been averaged instead of subtracted
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Ответ:
The messenger should use addition and Subtraction instead of multiplication and division
Step-by-step explanation:
It is given that,
A biker can ride a bicycle 18 miles in 3 hours. the messenger estimates that it will take 7 hours to bike 22 miles.
He has done two steps :
step 1: 22-18=4
step 2: 3+4=7
The steps done by the biker are wrong. The correct step should be :
In 1 hour, he should cover (18/3) miles i.e. 6 miles
In 7 hours, he will cover (6×7) miles i.e. 42 miles
It means he should use addition and Subtraction instead of multiplication and division. Hence, the correct option is (c).
Ответ:
hope this helps