book Maths Puzzle Numerical Ability

An orange has 20 fewer calories than a banana. If 7 bananas have the same number of calories as 9 oranges, how many calories are in a banana?

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My daughter says that her teacher did not explain how to convert unit multipliers.? I am not sure what she is asking. Can you help us please.
Thank you. suppose that f(x)=ax+b if (f(x))=8x+21 then what is a+b