According to the calculation, 13.5 tablespoons of concentrate need to be mixed with 9 gallons of water.
Given that the directions for a weed spray concentrate state that 3 tablespoons of the concentrate should be mixed with 2 gallons of water, to determine how many tablespoons of concentrate need to be mixed with 9 gallons of water, the following cross multiplication calculation must be performed :
- 2 = 3
- 9 = X
- 9 x 3/2 = X
- 27/2 = X
- 13.5 = X
Thus, 13.5 tablespoons of concentrate need to be mixed with 9 gallons of water.
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