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3 years ago

9

The ratio of the number of boys to the number of girls in orchestra is 3 to 2. There are 40 girls in the orchestra. How many boy

s are in the orchestra? HEP FAST PLS IM GIVING BRAINLIEST!!

1 answer:

slava [35]3 years ago

4 0

Answer:

60

Step-by-step explanation:

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If CDE ~ GDF, find ED

qaws [65]

Answer:

10

Step-by-step explanation:

$\triangle CDE \sim \triangle GDF.. (given) \\\\\therefore \frac{CD}{GD} =\frac{DE}{DF}.. (csst) \\\\\therefore \frac{15}{x+3} =\frac{3x+1}{4}\\\\ \therefore \: 15 \times 4 = (x + 3)(3x + 1) \\ \\ \therefore \: 60 = 3 {x}^{2} + x + 9x + 3 \\ \\ \therefore 3 {x}^{2} + 10x + 3 - 60 = 0 \\ \therefore 3 {x}^{2} + 10x - 57 = 0 \\ \therefore 3 {x}^{2} + 19x - 9x - 57 = 0 \\ \therefore \: x(3x + 19) - 3(3x + 19) = 0 \\\therefore \: (3x + 19)(x - 3) = 0 \\ \therefore \: 3x + 19 = 0 \: \: or \: \: x - 3 = 0 \\ \therefore \: x = - \frac{19}{3} \: \: or \: \: x = 3 \\ \because \: x \: can \: not \: be \: - ve \\ \therefore \: x = 3 \\ ED = 3x + 1 = 3 \times 3 + 1 \\ \huge \red{ \boxed{ ED= 10}}$

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3 years ago

Y = x +4<br> 3x + y = 16

Vesna [10]

Answer:

x= 3 while fo y = 7 that's the answer

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Marysya12 [62]

Answer:

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Step-by-step explanation:

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Hi do you want which is greater 0.75 x 81 or 0.9 x 81.

anygoal [31]

Answer:

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Step-by-step explanation:

0.9 is actually 0.90 and 90 is greater than 75

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