exam Maths Puzzle Numerical Ability

The odds of John winning a marathon are 3:7. What is the probability that John will win his next race?

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exam Other Question
Given that g(x) = (x^2 -1)/(5+x)
Find g(-1)

I get 0/4 which is 0, but that is not correct.

Thanks How come the variable sometimes is next to more then one number when there is more then one variable i get confused