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ArbitrLikvidat [17]
3 years ago
12

Twenty-five decreased by one fifth of a number is 18. Find the number.

Mathematics
2 answers:
BaLLatris [955]3 years ago
5 0

Answer:

35

Step-by-step explanation:

You have to work backwards, you find what 25-18 is (7)

7 is a fifth of the number you are looking for

so all you have to do is 7 x 5 and you get 35

sp2606 [1]3 years ago
4 0

Answer:

35

Step-by-step explanation:

We have the following equation that represents the problem:

25 - \frac{1}{5}x = 18, where x is the answer we are looking for.

We can subtract both sides by 18:

25 - 18 - \frac{1}{5}x = 0

7 - \frac{1}{5}x = 0

add \frac{1}{5}x to both sides:

7  = \frac{1}{5}x

multiply both sides by 5:

35 = x.

Here, x = 35

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Find the measures of the angle, its complement, and its suplement if three times the measure of a suplement of an angle is eight
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The angle, its complement, and its supplement are 36, 54 and 144 degrees respectively

<h3>Supplementary and complementary angles</h3>

The sum of complementary angles s 90 degrees while that of supplementary angles is 180 degrees.

Let the complement of an angle be 90 -x and its supplement be 180 -x

If three times the measure of a supplement of an angle is eight times the measure of a complement of the angle, then;

3(180-x) = 8(90-x)

Expand

540-3x = 730 - 8x

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180 = 5x

x = 180/5

x = 36 degrees

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Supplement = 180 - 36 = 144 degrees

Hence the angle, its complement, and its supplement are 36, 54 and 144 degrees respectively

Learn more on complement and supplement here; brainly.com/question/13517672

#SPJ1

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