exam Maths Puzzle Numerical Ability

please help if you can,

Solve this system of equations

4a+7b=27

8a-3c=-22

6b-3c=24

The solution is [],[],[] Thank you

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exam Other Question

When John F. Kennedy was Sworn in as President, he was 1 year older than Teddy Roosevelt was when Roosevelt took the office. If the sum of their when each became President was 85, how wold was Kennedy when he was sworn in? A triangular region has a perimeter of 66 meters. The first side is two-thirds of the second side. The third side is 14 meters shorter than the second side. What are the lengths of the three sides of the triangular region?