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x 40
di kali lurus
40x = 600
x = 15 orang..
semoga membantu ya..
40(12+x) = 12.50
480+40x = 600
40x = 600 - 480
40x = 120
x = 120/40
x = 3
jadi jumlah orang yg membantu tsb adalah 3 orang