The ratio of the number of boys to girls is 5:7 if there are 600 studens in school how many girls are there

Mathematics

1 answer:

Art [367]2 years ago

8 0

Answer:

There would be 350 girls in the school.

Step-by-step explanation:

We can find this by creating two proportions. the first fraction would be the number of girls out in the sample:

7/12

The second part would be the amount of girls in the whole school. We can set the girls as x since we do not know.

x/600

Now we can set the two equal to each other and cross multiply.

7/12 = x/600

600*7 = 12*x

4200 = 12x

350 = x

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boyakko [2]

A. $\vec{KI}$ is the secant line on the below circle.

<u>Step-by-step explanation:</u>

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3 years ago

By selling a cow for Rs 144, there is a profit of the same percentage as its cost price. Find the cost price.

hjlf

Answer:

Step-by-step explanation:

<h2><u>☼︎</u><u>Answer:</u></h2>

The cost price of cow = Rs.80

Explanation:

<h2><u>☼︎</u><u>Given :-</u></h2>

By selling a cow for Rs 144, there is a profit of the same percentage as its cost price.

The cost price.

The cost price of cow = Rs.x

<h2><u>☼︎</u><u>Solution :-</u></h2>

$\sf x + x \: of \: x\%= 144 \\ \\ \sf \implies x + \frac{x \times x}{100} = 144 \\ \\ \sf \implies {x}^{2} + 100x - 14400 = 0 \\ \\ \sf \implies x(x - 80) + 180(x - 80) = 0 \\ \\ \sf \implies x + 180 = 0 \\ \\ \sf \implies x = - 180 \\ \\ \sf \therefore \: {\boxed{ \sf \pink{x = 80}}}$