When 40% of the girls left the school assembly, the ratio of the number of boys to girls became 3 to 4. if there were w girls when the assembly started, what was the total number of boys and girls when the assembly started?

Number of girls at the time of the assembly started = w

Number of girls left = 40% of w

Remaining girls =

Now, the ratio of the number of boys to girls became 3 to 4.

Let n be the number of boys.

Then,

Or,

20n = 9w

or, n =

Total number of boys and girls =

Hence, the total number of boys and girs is

6e14 is the answer.

y=20x

: )

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