Question

In a fish tank 6/7 of the fish have red stripes on them if 18 on the fish have a stripes on them how many total fish are there in the tank

Answer 1

6/7 of the total fish have red stripes
18 of the total fish have red stripes

so 6/7 of the total fish = 18
lets x represent the total number of fish...

6/7x = 18
x = 18 / (6/7)
x = 18 * 7/6
x = 126/6
x = 21 <=== so there are 21 total fish