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Nimfa-mama [501]
3 years ago
9

7) There are 90 boys and 60 girls in the Cobb 6th grade campus band. Of these band members 9 boys and 3 girls play the trumpet.

What percent of the band members play the trumpet?
Mathematics
1 answer:
djyliett [7]3 years ago
3 0

Answer:

the percentage of band members play the trumpet is 8%

Step-by-step explanation:

The computation of the percentage of band members play the trumpet is shown below:

= Play trumpet people ÷ Total people

= (9 + 3) ÷ (90 + 60)

= 12 ÷ 150

= 8%

Hence, the percentage of band members play the trumpet is 8%

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jarptica [38.1K]

Answer:

3 gallons

Step-by-step explanation:

Let

x ----> the amount of pure acid (100% solution) in gallons

Remember that

100\%=100/100=1

20\%=20/100=0.20

60\%=60/100=0.60

we know that

(1)(x)+(0.20)(3)=(0.60)(x+3)

solve for x

x+0.60=0.60x+1.80

x-0.60x=1.80-0.60\\0.40x=1.20\\x=3\ gal

therefore

3 gallons of pure acid should be mixed with 3 gallons of a 20% acid solution in  order to get a 60% acid solution

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