Question

In a forest 4/7 of all the trees are conifer and the rest are leaf-bearing. Among the leaf-bearing trees 7/15 are oak and 2/3 of these oaks are new. There are 160 old oaks in the forest. How many trees in all are in the forest?

Answer 1

2400

Explanation:

no. of trees in forest = x

leaf bearing = 3/7x

oaks = (3/7x)*7/15 = x/5

old oaks = (x/5)*1/3 = x/15 = 160

x = 15*160 = 2400

1028.57143 leaf bearing