3 years ago

Insert one pair of bracket to make this calculation correct . 7 - 5 - 3 + 4 = 9

1 answer:

3 0

7-(5-3)+4=9 is the answer

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tatuchka [14]

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15 races

Step-by-step explanation:

The team has competed in 45 and has won 30. So the success rate is:

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$Sccess\ rate=r= \frac{30}{45}*100\\ =66.7\ percent$

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$\frac{30+x}{45+x}=0.75\\ 30+x = 0.75(45+x)\\30+x=33.75+0.75x\\x-0.75x=33.75-30\\0.25x=3.75\\x=\frac{3.75}{0.25}\\ x=15$

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3 years ago