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Order of Operations

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Question

There are $40$ children in a class. The number of boys in the class is three times the number of girls. How many girls are there in the class?

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Solution

We have
Total no, of students is the class $= 40$
Let No. of girls be $x$
Then No, of Boys $= 3 x$
Now
No. of boys +No. of girls $= 40$
$3 x + x = 40$
$4 x = 40$
$x = 10$
Hence the no. of girls in the class is $10$ .

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