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choixongdong
4)
pine tree is most numerous on tree farm which is  40% 

5)
if 480 trees total,
pine trees = 480 x 0.40 = 192 trees

6)
if 480 trees total,
spruce trees = 480 x 0.30 = 144 trees
(p.s. also firm trees = 144 (same as spruce trees)