Multiple choice softskills business skills

A solution(I) of concentration 40% milk is mixed with another solution(II) of concentration 50% to obtain a resultant solution of ocncentration 47%. In what ratio are the two solutions(I & II) mixed?

  1. 3:6

  2. 4:6

  3. 4:7

  4. 3:7

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Using allegation method: difference from 47% gives (50-47):(47-40) = 3:7. So Solution I (40%) and Solution II (50%) mix in ratio 3:7. Alternatively: (40x + 50y)/(x+y) = 47 gives x/y = 3/7.