What is happening
You arrive at a kitchen doubling a recipe for a family gathering.
The doubled batch has to come to thirty-six rotis and the original recipe card has been mislaid.
DoublingRunning
Doubled batch
73.6rotis
Required batch
36rotis
Fraction wheel. Original recipe at 37 rotis. Doubled batch 73.6 rotis, Required batch 36 rotis. Currently doubled batch is over by 37.6 rotis.
What has to balance