exam Maths Puzzle Numerical Ability

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

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exam Other Question

The odds of John winning a marathon are 3:7. What is the probability that John will win his next race? Can someone help me on this problem?

I need to convert 6.3 to a percent.

Is it 6.30%?

Thanks,
Sher