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Eddi Din [679]
3 years ago
5

90% of what number is 57

Mathematics
1 answer:
aliina [53]3 years ago
4 0
To solve this, set up the equation, 90% of x being .9*x=57. Then, solve for x, x=57/.9=6 \frac{1}{3}=6.333
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Answer:

To find the number of nickels and dimes, we can use this equation: 0.10d + 0.05n = 5.25

We are given the information that Sonji has 21 dimes (which means that d=21). We can use the equation to find the number of nickels n.

0.10d + 0.05n = 5.25

0.10(21) + 0.05n = 5.25

2.10 + 0.05n = 5.25

0.05n = 3.15

n = 3.15 / 0.05

n = 315 / 5

n = 63

Sonji has 63 nickels.

Let's check our answer.

21(0.10) + 63(0.05) = 2.10 + 3.15 = 5.25

It seems that our answer is correct.

Step-by-step explanation:

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Answer:

Total time spent by Tiwa to set up the computer and install software = 6 hours

Step-by-step explanation:

Given:

Time spent by Tiwa to set up  her computer = 1\frac{1}{2}\ hours

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To find the total time Tiwa took to set up her computer and install the software.

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Time spent by Tiwa to install the software can be given as:

⇒ 3\times 1\frac{1}{2} \ hours

<em>In order to multiply mixed numbers we first change them to fractions.</em>

We multiply the denominator to the whole number and add the numerator to it. Then we write the number as numerator of a fraction with the same denominator.

So, 1\frac{1}{2}=\frac{3}{2}

So, we have:

⇒ 3\times \frac{3}{2}\ hours

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⇒ \frac{3}{2}\ hours+\frac{9}{2}\ hours

Since denominators are same, so we simply add the numerators.

⇒ \frac{3+9}{2}\ hours

⇒ \frac{12}{2}\ hours

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Step-by-step explanation:

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