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expeople1 [14]
3 years ago
15

3. In a certain school, there are 456 girls. Calculate the total number of students

Mathematics
1 answer:
marin [14]3 years ago
7 0

Answer:

3) girls = 24% = 456

let the total number of students be = x

\frac{24}{100}  \times x = 456

x = 456 \times  \frac{100}{4}

x = 1900

the total number of students is 1900

4) increase = 20%

new salary = 24000 rupees

let his original salary be = y

\frac{20}{100}  \times y = 24000 - y

0.2y = 24000 - y

0.2y + y = 24000

1.2y = 24000

y =  \frac{24000}{1.2}

y = 20000

his original salary is 20,000 rupees

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The price of a computer was decreased by 20% to £136. <br> What was the price before the decrease?
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£ 170 .

Step by step explanation :

Given that the price of a computer was decreased by 20% to £136. And we need to find the Original price before the decrease. So , let the earlier price be x ,

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<h3><u>Hence</u><u> </u><u>the</u><u> Original</u><u> price</u><u> </u><u>was</u><u> </u><u>£</u><u> </u><u>1</u><u>7</u><u>0</u><u> </u><u>.</u></h3>

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<span>2(11r + 7) + 1 = 1/4 (88r+60)
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simplify
22r + 15 = 22r + 15 
0 = 0
answer: infinite solutions</span>
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