Question

Arnold exercised from 5:00 p.m. until 6:30 p.m.. In that time, he took one twenty-minute break. The rest of the time, he did jumping Jack's. He did 10 jumping Jack's each minute. How many jumping Jack's did Arnold do?

Answer 1

700 Jumping Jacks

1) Gathering the data:

Training Time: 5:00 - 6:30 = 1:30 (one hour and a half)

10 Jumping Jack per minute.

One 20 minute break

2) Since there was only one 20 minute break then Arnold exercised for 1:30 hour - 20 min = 1 hour and 10 minutes

1 hour and 10 minutes are equivalent to 70 minutes for 1 hour = 60 minutes.

10 Jumping Jacks per minute in 70 minutes yields:

$10\times1\times70=700$

3) Hence, Arnold did 700 Jumping Jacks