exam Maths Puzzle Numerical Ability

i dont expect all those problems solved, but i'm having a hard time understanding it. my teacher says i must find the LCD but i don't understand how to find it. and when i try, i a

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One number is 12 more than another. The sum of the smaller number and twice the larger number is 39. Find the larger number.
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34 Hello: Can you help me to solve: {{{Given: h(t)=t^2+2t and p(t) = 3-t}}}
a. find: (p-h)(t)
b. find: h(p(t))