20 is 30% of what number? If necessary, round to the nearest tenth.

Mathematics

2 answers:

Ksju [112]3 years ago

7 0

150 I believe is the answer

mario62 [17]3 years ago

7 0

20 is 30% of some number, so divide 20 by that percentage converted to a decimal:
20 / 0.3 = 66.67

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Data;

Total number of tool rented out = 25
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<h3>System of Equations</h3>

To solve this problem, we have to write a system of equations to represent the problem.

since we have

x = self - propelled mower
y = riding mowers

Let's write equations with these variables.

$x+y = 25...equation (i)\\20x+40y = 900...equation(ii)$

From equation (i)

$x+y= 25\\x = 25 - y...equation(iii)$

Put equation (iii) into equation (ii)

$20x+40y=900\\x = 25-y\\20(25-y)+40y=900\\\\500-20y+40y=900\\500+20y=900\\20y=900-500\\20y=400\\\frac{20y}{20}=\frac{400}{20}\\ y=20$

Let's substitute the value of y into equation(i)

$x+y =25\\x+20 = 25\\x = 25 - 20\\x = 5$

From the calculations above, they rented 5 self-propelled mowers and 20 riding mowers.

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$\boxed{\sf x=-2}$