1/3 chance. You have 15 marbles 5 which are black. That makes it 5/15 which reduced would be 1/3
I think it’s 8.33 repeating
Explanation:
85% efficiency of simple machine means that with 100% input, the machine will give a work output of 85%. EXPLANATION: The efficiency of a machine is the ratio of its Mechanical Advantage to its Velocity
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