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how much tea is gained at what cost of coffee?
a. in moving from u to v \boxed{} tea is gained at the cost of \boxed{} coffee.
b. in moving from w to x \boxed{} tea is gained at the cost of \boxed{} coffee.
c. in moving from y to z \boxed{} tea is gained at the cost of \boxed{} coffee.

(chart: quantity of coffee (y-axis) vs quantity of tea (x-axis) with points u, v, w, x, y, z)

Explanation:

Step1: Read U and V coordinates

U: $(0, 240)$, V: $(20, 220)$

Step2: Calculate tea gain, coffee loss (U→V)

Tea gain: $20-0=20$; Coffee loss: $240-220=20$

Step3: Read W and X coordinates

W: $(40, 200)$, X: $(60, 140)$

Step4: Calculate tea gain, coffee loss (W→X)

Tea gain: $60-40=20$; Coffee loss: $200-140=60$

Step5: Read Y and Z coordinates

Y: $(65, 60)$, Z: $(70, 0)$

Step6: Calculate tea gain, coffee loss (Y→Z)

Tea gain: $70-65=5$; Coffee loss: $60-0=60$

Answer:

a. 20 tea is gained at the cost of 20 coffee.
b. 20 tea is gained at the cost of 60 coffee.
c. 5 tea is gained at the cost of 60 coffee.