Answer:
60
Explanation:
If 12 men are needed to run 4 machines. How many men are needed to run 20
we can solve with an equation
12 : 4 = x : 20
x = 12 * 20 : 4
x = 240 : 4
x = 60
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check
12 : 4 = 60 : 20
3 = 3
the answer is good