book Maths Puzzle Numerical Ability

if 2x+y=7,what is the value of y when x=3

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book Other Question

find factors of 20y^4x+12yx^2+4y^2x^2-8xy Wes is mixing peanuts and chocolate pieces. Peanuts sell for $4.50 a pound and the chocolate sells for $6.50 a pound. How many pounds of chocolate mixes with 5 pounds of peanuts to