Answer: hope this will help you
Step-by-step explanation:
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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 
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The inequality is:
48 c + 200 ≤ (the maximum load allowed on the elevator) .