exam Maths Puzzle Numerical Ability

2x-y=-3
x+4y=9

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exam Other Question

how do you find the missing number (averages)?

homework grade 87
homework grade 79
next test must score ? to get an average grade of 98
A bag of peanuts is worth 30 cents less that a bag of cashews. Equal amounts of peanuts and cashew are used to make 40 bags of a mixture that sells for $1.05 per bag. How much would a bag of cashews be worth?