Mathematics, 16.04.2021 03:20 mjwaple57

When Jennifer does 9 push-ups and 6 sit-ups. it takes a total of 45 seconds. In comparison, she needs 69 seconds to do 9 push-ups and 14 sit-ups. How long goes it take Jennifer to do
each kind of exercise

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When Jennifer does 9 push-ups and 6 sit-ups. it takes a total of 45 seconds. In comparison, she nee...