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21 Student it is who didn't participate in any activities

21 students

Explanation:

21 students did not participate in after school activities.

Percentage solution with steps:

Step 1: Our output value is 210.

Step 2: We represent the unknown value x.

Step 3: From step 1 above,$210=100%

Step 4: Similarly, x=10%.

Step 5: This results in a pair of simple equations:

210=100%(1)

x=10%(2)

Step 6: By dividing equation 1 by equation 2 and noting that both the RHS (right-hand side) of both equations have the same unit (%); we have

210/x=100%/10%

Step 7: Again, the reciprocal of both sides gives

x/210=10/100

→x=21

Therefore, 10% of 210 is 21.

Have a beautiful day, and stay safe.

15 batches are the most you can make

step-by-step explanation: