At a local produce stand sugarâ€“coated strawberries sell for $3 per pound and chocolate covered bananas sell for $4 per pound. How many pounds of strawberries must be purchased to have a 5â€“pound mixture that costs $3.60 per pound?
I cannot read your total mixture weight so lets call it W. You can put in the right amount later.
Let x = the number of pounds for the strawberries
W -x is the number of pounds of the bananas.
3x is the value of the strawberries
4(W-x) is the value of the bananas
3.6W is the total value
3.6W = 4(W-x) + 3x
3.6W = 4W - 4x + 3x
Rearranging: x = .4W
Just substitute in what ever your total mixture weight W is.