book Maths Puzzle Numerical Ability

how many kilograms of coffee beans selling for $2.40 per kilogram should be mixed with 3 KG of cofee beans selling for $4.00 per KG to obtain a mixture selling for $2.88 per KG?

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book Other Question

How do you graph piecewise functions?
Example:
f(x)= {x+2 if x < or equal to -2
{3x if x > -2

Do you plug in a number that is less than or equal to -2 for the first sta How would you solve y=-1/3+23/3 then graph it?