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labwork [276]
3 years ago
12

In the school gym, the ratio of the number of boys to the number of girls was 4:3. After 160 boys left the gym, the ratio became

4:5. How many girls were there in the gym?
Mathematics
1 answer:
Soloha48 [4]3 years ago
8 0
62 girls I think lmaohlmaohhsjsbusbusbsjshdhbsusshdvwlhz
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Alchen [17]

Answer:

n = 9

Step-by-step explanation:

20 + 18 + ... + 6 + 4

---------------------------

a = 20 ; d = -2 ; n = ?

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4 = 20 + (n-1)(-2)

-16 = (n-1)(-2)

---------

n-1 = 8

n = 9

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S(9) = (9/2)(20+4)

S(9) = 4.5*24

S(9) = 108

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5 - 4 = 1

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To find the area of a triangle multiply half the sum of the bases by its height, i think?

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