exam Maths Puzzle Numerical Ability

Kayla would be one-half as old as Nathan if Kayla were 4 years older. Nathan is eight less than three times as old as Kayla. How old are they?

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simplify

-18a 6th power 4x 3rd power
______________ X ______________
x 2nd power 9a 2nd power
Jose rode his trail bike for 10miles. Two-thirds of the distance was over a mountain trail. How long was the mountain trail?