Acertain drug is made from only two ingredients: compound a and compound b. there are 4 milliliters of compound a used for every 7 milliliters of compound b. if a chemist wants to make 671 milliliters of the drug, how many milliliters of compound a are needed?

answer:

there are 5 milliliters of compound a used for every 8 milliliters of compound b.

if a chemist wants to make 884 milliliters of the drug, how many milliliters of compound a are needed?

:

we know the ratio of a to b is 5: 8

let x = the multiplier

then

5x = amt of compound a

and

8x = amt of compound b

:

5x + 8x = 884

13x = 884

x = 884/13

x = 68 is the multiplier

therefore

5(68) = 340 millilters of compound a needed

:

:

confirm our answer. find the amt of b

8(68) = 544 ml of b

340 + 544 = 884

step-by-step explanation:

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.