An industrial machikne is able to make 9 pens in 3 seconds. what is the rate made per second?

This problem can be solved using proprtions.  Once you set up the proportion, the calculations are easy.

Let x = number of pens made in 1 second.

Now, you just cross multiply and solve.

9 = 3x

x = 3

The rate is 3 pens per second.

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step-by-step explanation:

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i those same problems in math and dont know how to do them