exam Maths Puzzle Numerical Ability

Jose rode his trail bike for 10 miles. Two thirds of the distance was over a mountain trail. How long is the mountain trail?

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exam Other Question

the sum of two number is 143.one number is 49 less than the other. what one the number? I know the answer is x=6 which is how many rolls of nickels, then 12 rolls of dimes and 18 rolls of quarters but I don't understand how to write it into an equation