The given ratio of lion to tigers in the zoo is 1:3 .
The question is asking us to find the number of tigers when the number of lions are 4.
Lion:Tiger =1:3
When number of lions are 4 then we multiply both the ratio by 4
Lion :Tiger= 1x4:3x4 (We can multiply both the ratio by same number)
Lion :Tiger = 4:12 ( 1x4=4 and 3x4=12)
Number of Tigers are 12 if number of lions are 4.