exam Maths Puzzle Numerical Ability

i have a total of 47,000 products shipped out over the past 3 years. out of that 47,000 i have had a total of 282 defects. what would be the average ratio of number of defects per 1,000 products shipped over the past 3 years?

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exam Other Question

Solve the system of equations. Determine the number of solutions for each.
{1/3x+y=9
{-2x+2y=-6 this is question number nine a up to question is what I have to do for homework and, well I was in the groove at school and now I have lost the groove and have completely forgotten hoe to do it!.

please help

Bethaney