Asap! a pharmacist wishes to mix a solution that is 5% minoxidil. she has on hand 90 ml of a 1% solution and wishes to add some 7% solution to obtain the desired 5% solution. how much 7% solution should she add? whom ever answer correctly gets brainliest.

let x be volume of 1% and let y represent volume of 7% solution.

then the amount of minoxidil is

0.01x + 0.07y = 0.05(x+y)

but we have that x = 90 ml so

0.01(90) + 0.07y = 0.05(90+y)

0.9 + 0.07y = 4.5 + 0.05y

0.02y = 4.5-0.9

y = 3.6/ 0.02

y = 180 ml

she should add 180 ml of 7%

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6