exam Maths Puzzle Numerical Ability

what is the answer to 8n+n-36n+4

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exam Other Question

Lina Chen invest $24,000, part at 8% and the rest 7.2%. How much did she invest at each rate if her income from the 8% investment is two thirds that of the 7.2% investment? I need help with this homework problem:
t+22/t square-t-72 + 8/t-9 = 4/t+8

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