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

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