exam Maths Puzzle Numerical Ability

How many gallons of a 60% antifreeze solution must be mixed with 100 gallons of 15% antifreeze to get a mixture that is 50% antifreeze?

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Page 132 - Problems, 81-89 Odd I need to write these two problems in the following in Ax+By=C Form

1.) with slope 2/3 through (-1,-4)


2.) through (-4,5) and (-2,-3)