exam Maths Puzzle Numerical Ability

please help

For every 210 high school students, there are 5880 people living in the community. If the community has 1325 high school students, how many people live in the community

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exam Other Question

Solve by the elimination method.

9x-9y=36

7y-3x= -14
What is the solution of the system?
Can someone explain this to me? I do not understand this at all...not of it.
{1,3}, (2,6), (3,9), (4,11}