book Maths Puzzle Numerical Ability

Solve the linear system - If the system is inconsistent or dependendent, so state:

14x-13y = 5
28x-26y=10

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book Other Question

How much money should be invested at an anual rate of 12% in order to earn $300 interest in a year?
$______
Thank you Find three consecutive integers such that twice the smallest is 12 more than the largest ?