Answer:
150*2/3=100
take school size then multiply it by the ratio to get the amount of student who prefer such toothpaste.
Step-by-step explanation:
Well, you first have to make the mixed fraction into an improper fraction. You then multiply the two fractions and ad the whole number into the total.
That's how i was taught back in the 4th grade... i'm not sure if it's correct but i hope it is-
Divide 3 from both sides to get a=57/3 then a=19