A cinema has 600 screens 35% go to screen 1 Four times as many go to screen 2 as go to screen 3 How many people go to screen 2?

I suspect this question should be:  600 people go to a three-screen cinema. If so, then:

 

Number in screen 1 = 0.35*600 = 210

This leaves 390 people to go to screens 1 and 2.

 

Let n be the number that go to screen 3.  Then we have n + 4n = 390 or 5n = 390

so n = 390/5 = 78

 

Hence the number in screen 2 is 4n = 4*78 = 312

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