Three identical blocks connected by ideal (massless) strings are being pulled along a horizontal frictionless surface by a horizontal force f⃗. (figure 1)the magnitude of the tension in the string between blocks b and c is t = 3. 00 n. Assume that each block has mass m = 0. 400 kg.

Raul has one solution that is 20% acid by volume and one solution that is 50% acid by volume. he plans to mix together some of each solution to create 30 milliliters of a solution that is 40% acid by volume. how many milliliters of the 20% acid solution should raul use to create the 40% acid solution? can someone explain this to me? i know that the answer is 10 milliliters, but i don't know how to get it.