Answer :

downs1997
5%   x
100   8   Cross multiply and divide = .4

8* 5% = .4

8* .05 = .4
AL2006
5% means 0.05

0.05 of the catch = 8 tuna

Divide each side by 0.05 :

the catch = 8 tuna / 0.05 = 160 tuna