A cedar tree is 15 m tall. Its base is 8 m from a shorter pine tree. The ends of the shadows of both trees coincide to form similar triangles.
The shadow of the cedar tree extends 10 m from its base.
How tall is the pine tree?

Two farmers pay a total rent of $140 for a pasture. the first farmer placed $4 oxen in the pasture, and the second farmer placed $30 sheep in the pasture. the farmers split the rent based on the proportion of the pasture eaten by their own animals that month. how much should the first farmer pay, if 1 ox eats as much as 10 sheep in a month?