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2 years ago

the average of johnnys two tests is a 92. what must he get to on a third test to raise his average to a 94

1 answer:

8 0

N=3 tests and the average is 94
3*94= 282
92+92 (add the average scores) = 184
282-184=98
He needs a 98 to raise his average to a 94

Hopefully this helps...

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Among the 7th graders in a middle school, three quarters of them play at least one sport. Among the 7th graders who play sports,

kifflom [539]

Answer:

512

Step-by-step explanation:

Let the number of 7th graders in the school is x.

As three-quarters of them play at least one sport, so, the number of 7th graders who play sport = $\frac 3 4 x$ .

Among the 7th graders who play sports, half of them play more than one sport. So, the number of 7th graders who play more than one sport $= \frac 1 2\times \frac 3 4 x=\frac 3 8 x$ .

Among the 7th graders who play more than one sport, one-third of them play more than two sports. So, the number of 7th graders who play more than two sport $= \frac 1 3\times \frac 3 8 x=\frac 1 8 x$ .

Among the 7th graders who play more than two sports, one-quarter of them play more than three sports.

So, the number of 7th graders who play more than three sport $= \frac 1 4\times \frac 1 8 x=\frac{1}{32} x$ .

7th graders play more than three sports at the school= 16

$\Rightarrow \frac{1}{32} x=16$

$\Rightarrow x =16 \times 32$

$\Rightarrow x = 512$

Hence, the total numbers of 7th graders in the school are 512.

4 0

3 years ago

Divide 4860 in the ratio of 5:4:3

tigry1 [53]

Total portions are
5+4+3
12
One portion,
4860 / 12
405 So
5 : 4 : 3
5*405 : 4*405 : 3:405
2025 : 1620 : 1215

7 0

3 years ago

PLEASE HELP!!!!!!!!!!! ASAP!!!!!!!!!!!

asambeis [7]

Answer:

at 1 pm

Step-by-step explanation:

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3 years ago

Tarzan is swimming east at 2.4 m/s across a river that is 1660 meters wide and

timurjin [86]

The final rate is 6.5 m/s

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3 years ago

Find the vertex form of the function then find the following a) intercepts b) vertex c) maximum or minimum d) range

Ganezh [65]

Vertex form; y = 5(x - 3)² - 85
x-intercept; (3, +√17, 0) , (3 -√17, 0)
y-intercept; (0, -40)
minimum value at -85
range; [-85, ∞), {y|y ≥ -85}

hope this helps, God bless!

5 0

2 years ago