What quantity of a 30% solution do you need to make 150 ml of a 20% solution?

a. 150 ml
b. 200 ml
c. 50 ml
d. 100 ml

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post