Add strawberry (left / A or tap the red bin) and banana (right / D or tap the yellow bin) scoops to match the customer's ratio, then serve (Space or tap the blender). Backspace/Enter removes a scoop. Level 2 adds scaled recipes and unit-rate rounds (use up/down to choose the answer).
Please use an up-to-date browser with WebGL and an internet connection (the 3D library loads from a CDN).