Four milliliters of ink a is added to 10 milliliters of ink b, forming a mixture of inks. ink a contains 10% blue pigment. ink b
contains an unknown percentage of blue pigment. the mixture of the two inks contains 35% blue pigment.

Step-by-step explanation:

Pigment in A + Pigment in B = Pigment in mixture

0.10 (4) + x (10) = 0.35 (4 + 10)

0.4 + 10x = 4.9

10x = 4.5

x = 0.45

Ink B contains 45% blue pigment.

step-by-step explanation:

you divide the denominator by the numerator on both sides and if the quotients are equal then the fractions are equivalent

what is the question? i am guessing you are looking for the area.

to find an area, you have to do length x width.

in this case, it would be 12 ft x 4 ft = 48 sq. ft