If Dev can make 40 chairs in 20 days, working 10 hours per day then in how many days can he make 10 chairs working 8 hours per day?
solved by chain rule,
$$M1\times H1\times D1\times W2$$= $$M2\times H2\times D2 \times W1$$
$$10\times 10\times 20$$= $$8\times D2 \times 40$$
D2 =Â
$$6\frac{1}{4}$$
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