exam Maths Puzzle Numerical Ability

I need help.
Suppose that A^-1=Matrix[2 -1] find A
3 5

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exam Other Question

find three consecutive odd integers such that the sum of the smallest and 4 times the largest is 61 This problems is about solving the equation containing a fraction.

The problem is: 5/3n-8 = n/n+8
n+2
Lcm is is 3n-8 and n+2 right?