Question

we apply 35% of a drug at the morning and 25% of the same drug at the afternoon. if in the evening 28 mL of the drug is left. how many milliliters are we applying during the whole day?

Answer 1

Answer:

we are applying 70 ml during the whole day

Step-by-step explanation:

First, it is necessary to calculate the percentage of the drug that is left in the evening. This is calculated as:

100% - (35% + 25%) = 100% - 60% = 40%

Because,  35% is the percentage of the drug apply at the morning and 25% is percentage of the drug apply at afternoon.

Then, 40% is the percentage of the drug that is left in the evening and it is equivalent to 28 mL. So, the milliliter that we apply during the whole day are the milliliters equivalent to the 100%. We can calculate this by a rule of three as:

40% -------------------- 28 mL

100% -------------------    X

Where X are the milliliters that we apply during the whole day. Solving for X, we get:

$X=\frac{100*28}{40}=70 mL$