Question

Adding and subtracting rational numbers. Julie wanted to match Lisa's obstacle course record of 74.6 seconds. She has already spent forty and one-fourth seconds on wall climbing and 10.56 seconds on the ropes. How much time did she have left to match the record?

a. 23.79 seconds
b. 29.69 seconds
c. 34.35 seconds
d. 64.04 seconds

Answer 1

To find out how much time Julie had left to match Lisa's obstacle course record, we subtract the time she already spent from the record time. Julie spent 40.25 seconds on wall climbing and 10.56 seconds on the ropes. Therefore, she had 23.79 seconds left to match the record.

Step-by-step explanation:

To find out how much time Julie had left to match Lisa's obstacle course record, we need to subtract the time she already spent from the record time.

Julie spent forty and one-fourth seconds on wall climbing, which is 40.25 seconds. She also spent 10.56 seconds on the ropes. To find the total time she spent, we add these two amounts: 40.25 seconds + 10.56 seconds = 50.81 seconds.

To find out how much time she had left to match the record, we subtract the time she spent from the record time: 74.6 seconds - 50.81 seconds = 23.79 seconds. Therefore, Julie had 23.79 seconds left to match the record.