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x --------> 20
4/x = 20/30
x = (30 x 4) / 20
x = 120/20
x = 6
a. jadi totalnya butuh 26 orang
b. shg yg ditambah ada 6 0rg
20x = 4 x 30
20x = 120
x = 6
a) Tenaga yg dibutuhkan = 6 orang
b) Yang harus ditambah : 6 - 4 = 2 orang