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24 - 10%
240 = 100%
chłopaki
36 - 20%
180 -100%
razem= 240 + 180 = 320
;]
x - 100%
x= (100% * 36): 20%= 3600%:20%= 180 - tylu było chłopców
24 - 10%
x - 100%
x= (100% * 24): 10%= 2400%:10%= 240 - tyle było dziewczynek
240 + 180 = 420