Answer:
a. I'm not sure if there's more to the question but I can't answer without knowing how many is the whole class
B. 12 boys

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Step 1:

Write the equation
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step 2:

due to reciprocal 4 comes up and 3 comes down
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step 3:

divide 4 with 2
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step 4:

finally we get 0.667
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⚡final answer:
0.667✓
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hope it helped you:)
have a nice day!
Your answer is 89 since 4*10=40)+5*5=25)+2*12=24, add all the results up and get 89.