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Mathematics, 21.01.2021 18:00 spalmer7

When Mariana does 19 push-ups and 6 sit-ups, it takes a total of 75 seconds. In comparison, she needs 72 seconds to do 18 push-ups and 6 sit-ups. How long does it take Mariana to do
each kind of exercise?
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When Mariana does 19 push-ups and 6 sit-ups, it takes a total of 75 seconds. In comparison, she nee...
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