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aleksklad [387]
3 years ago
15

35% of 120 = 12% of 50 = 55% of 40 =

Mathematics
1 answer:
GrogVix [38]3 years ago
7 0

Step-by-step explanation:

p\%=\dfrac{p}{100}\\\\\\35\%=\dfrac{35}{100}=0.35\\\\35\%\ of\ 120\to0.35\cdot120=42\\\\\\12\%=\dfrac{12}{100}=0.12\\\\12\%\ of\ 50\to0.12\cdot50=6\\\\\\55\%=\dfrac{55}{100}=0.55\\\\55\%\ of\ 40\to0.55\cdot40=22

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Answer:

240kmh

Step-by-step explanation:

The distance that the train traveled in 30s is the difference of the total length of the tunnel and the train (2000m). This means it travels 2000m/30s. This ratio is the same as 240000/3600s or 240km/1hr.

4 0
2 years ago
Help on geometry please (answer #5)
jekas [21]

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3 years ago
3x - 5y = 14 and – 2x + 2y = 0
zubka84 [21]

Answer:

x=5.6

y=-5.6

Step-by-step explanation:

3x - 5y = 14 Equation 1

– 2x + 2y = 0 Equation 2

Simultaneous equation can be solved either through elimination method or substitution method. But we use elimination method for this question

Multiply equation 1 by -2 (the coefficient of x in equation 2) and multiply equation 2 with 3 (the coefficient of x in equation 1), so that x will have the same coefficient in the new equations, and easy to eliminate

-2(3x - 5y = 14)

-6x+10y=-28 Equation 3

3(– 2x + 2y = 0)

-6x+6y=0 Equation 4

Subtract equation 4 from 3 to eliminate x

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Substitute for y in equation 2

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7 0
2 years ago
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snow_tiger [21]
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3 0
3 years ago
Lynne was making cookies and she
charle [14.2K]

Answer:

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Step-by-step explanation:

We just need to double 2. The phrase "double" means to multiply by 2 so the answer is 2 * 2 = 4 cups of flour.

3 0
3 years ago
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