The product of the sum of the their rates and the time it took them to finish the job should be equal to one whole job. This may be expressed by the equation,
(1/9 + r) x 6 = 1
Solving for the value of r gives an answer of r = 1/18. Thus, Hector does 1/18 of the job in 1 hour.
250 mg / 100 mg = 2.5 ml
5 ml / 2.5 ml = 2
1/2 teaspoon
The answer is 4, correct me if I’m wrong.
The surface area is 54 square inches
