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sergejj [24]
2 years ago
6

The number of students at a high school was decreased by 30% to 420 after the senior students graduated how many students were a

t the high school before the decrease
Mathematics
1 answer:
olchik [2.2K]2 years ago
5 0

Answer:

Step-by-step explanation:

s(1-30/100)=420

s(100-30)/100=420

s(70/100)=420

s(7/10)=420

7s=4200

s=600

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