Eighth-graders 66654

The number of eighth-graders in primary school is 80 percent of the number of ninth graders. There are a total of 54 eighths and ninths. How many ninth-graders go to this school?

Correct answer:

b =  30

Step-by-step explanation:

q=80%=10080=0.8  a=q b a+b=54 a=0.8 b a+b=54  a0.8b=0 a+b=54  a=24 b=30

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