me understand how to solve these problems A chemist has 70 mL of a 50% methane solution. How much of a 80% solution must she add so the final solution is 60% methane? In a candy shop, chocolate which sells for $4 a pound is mixed with nuts which are sold for $2.50 a pound are mixed to form a chocolate-nut candy which sells for $3.50 a pound. How much of each are used to make 30 pounds of the mixture