An herbalist has 20 oz of herbs costing $4 per ounce. How many ounces of herbs costing $2 per ounce should be mixed with these 20 oz of herbs to produce a mixture costing $2.80 per ounce?

Th perimeter of a rectangular garden is 150 feet. the length is 50 feet longer than the width, w. which equation could be used to calculate the width of the garden? a.) 2w+ 2(w-50) =150 b.) 2w+50 + 2w =150 c.) 2(w+50) + w =150 d.) 2w+ 2(w + 50) = 150 need asap. will give brainliest !