A certain drug is made from only two ingredients: compound A and compound B. There are 5 milliliters of compound A used for every 4 milliliters of compound B. If a chemist wants to make 765 milliliters of the drug, how many milliliters of compound A are needed?

Hence amount of A required = 425 millimeters

Step-by-step explanation:

Ratio of A:B in the drug is 4:5

Total drug to be produced is 765 milliliters

Hence amount of A required = 5/9 x 765 = 425 millimeters

The quantity of compound "A" that is needed for that quantity of drug is 425millilitres.

Step-by-step explanation:

What is required to solve this is a basic idea or knowledge of the principle of ratios. According to the question, 5 millilitres of compound "A" must go together with 4 millimeters of compound "B" for every unit of the drug that must be produced.

This means that 5 millilitres of compound A will always go together with 4 millimeters of compound B.

Similarly 10 millilitres of A will require 8 millilitres of B.

Again, 15 millilitres of A must go together with 12 millilitres of B and so on.

Consider the case of having 10 millilitres of "A" which must go with 8 millilitres of B, totalling a combined quantity of 18 millilitres.

Assuming we do not know the different quantities of "A" and "B" that resulted in the combined quantity of 18 millilitres; if we know that A and B must ALWAYS be in the ratio 5:4 respectively, we can always figure out the different quantities of A and B in the drug.

Quantity of A = [5/(5+4)] × 18

= 5/9 × 18

= 10 ml.

Qty of B = [4/(5+4)] × 18

= 4/9 × 18

= 8ml.

We can apply this method to the 765ml drug that the chemist wants to make.

Since A and B are still in the ratio of 5:4 respectively, Then the quantity of compound A that is required is:

[5/(5+4)] × 765

= 5/9 × 765

= 425

Therefore the quantity of Compound "A" that is needed for the 765 millilitre drug is 425ml.

your question is incomplete, write all the numbers in the sequence that it tells you.  

step-by-step explanation:

answer:  

step-by-step explanation:

odd numbers are only divisible by 1 and itself.

even numbers are divisible by more than 1 and itself.

for example 6 is even because it is divisible by more than 1 and its self. 1 x 6= 6 ; 2 x 3= 6

and 7 is odd because only 7 x 1 equals seveb