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