A weed spray is made of wetting agent and herbicide in the ratio 91:9 respectively. To make 40L of weed spray, how much herbicide would be needed?
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Add the numbers in the ratio together (91 + 9 = 100) -- that's the denominator of the fractions.
91/100 (or 91%) is wetting agent.
9/100 (or 9%) is herbicide.
So you need 9% of 40L.
9/100 * 40
= 360/100
= 3.6L
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