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

A machine can produce article A in 12 minutes or article B in 16 minutes. If it is planned to produce twice as many of A as B in a working week of 40 hours, how many of each will b What would be another way to add 1+3+5+7+9+....499=to equal the sum of 62,500?
Only using odd numbers. We need another way to find the sum of all the odd numbers from 1 to 499 and equal 62,500