Lowest common multiple factor of 60 and 15

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?

What is the slope of any line parallel to the line 8x+9y=3 in the standard (x,y) coordinate plane?

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?