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For a) we can say the unsimplified ratio of machines to crates is 60:150
So to get the left hand side equal to 1, we divide both sides by 60, which gives us a ratio of 1:||2.5||

For part b) we now want the left hand side of the ratio to equal 70 to find the number of crates that would be packed
So we use the ratio from part a) and multiply both sides by 70 to give a ratio of 70:||175||, which means that ||175|| creates would be packed per day

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