exam Maths Puzzle Numerical Ability

How do you get the LCM?
{{{8+9}}}&{{{64-81s^2}}}&{{{8-9s}}}

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exam Other Question

I really need help:
In 5 years Chim will be three times as old as Jared. The sum of their ages is 42. How old are Chim and Jared.
Factor
5ay+15a-xy-3x