exam Maths Puzzle Numerical Ability

Evaluate the expression.
8(17 - 6.2)

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a forest contains about 500 trees. You randomly pick 67 trees and find that 27 of them are oaks. What is the experimental probability that a tree in the forest is an oak? Please help me.i have a coursework to submitted in two day time.but i seem can't find the answer to the question below as i was very poor in algebra.and it was quiet urgent.can an