exam Maths Puzzle Numerical Ability

number 8 on page 438 of my book.

x-2y<-6
5x-3y<-9

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exam Other Question

How many liters each of a 2% salt solution and an 10% salt solution must be combined to produce 30 liters of a 4% salt solution? I am having trouble with some word problems. The directions are as followed: formulate an inequality or inequalities for each scenario and find solutions, and graph each solution