3 years ago

If 9 is subtracted from a certain number and the difference is divided by 3

Mathematics

1 answer:

nekit [7.7K]3 years ago

8 0

Is answer 21? i assumed number as x then i followed the process

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At the beginning of the school year, the 7th grade class at Oak Hill Middle School has 480 students. There are 270 girls and 210

Dimas [21]

Answer:

Part 1: 43.75%

Part 2: 44.07%

Step-by-step explanation:

Hello!

(Pt.1) First, set up a ratio $210/480$ . Next, you use long division I got the percent 43.75. After that, you subtract 6 from the girls group, (because of them moving away and then more coming back.) and 2 from the boys group. Then, you subtract those from the school "population" and you get 472 as the final population. So then you set up another ratio, $208/472$ . I got a percent of 44.07% from that.