book Maths Puzzle Numerical Ability

Kerri, Ethan, and Jerry assembled a puzzle together in 40 hours. If Ethan worked twice as fast as Jerry and Kerri worked just as fast as Ethan, then how long would it have taken J

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book Other Question

Graph the equations
1. xy= -6
2 x^2 + 9y^2 = 9
3. x = y^2 -2 The revenue (in millions of dollars) from the sale of x units at a home supply outlet is given by r=.21x. The profit (in millions of dollars) from the sale of x units is given by p