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Conversion of Units

A cow gives y...

Question

A cow gives y litres of milk per week. Find the volume of milk she gives in a month of 31 days.

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Solution

31 = 28 + 3
= 7 $\times$ 4 + 3
= 4 weeks and 3 days

Volume of milk given per week = y L
Volume of milk given per day = $\frac{y}{7}$ L
Volume of milk given in 31 days = 31 $\times$ $\frac{y}{7}$ L = $\frac{31 y}{7}$

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