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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One of two supplementary angles is 4degrees more than 1/3 of the other angle. Find the measure of each of the angles. I'm haveing trouble with radicals. We have a quiz tomarrow and I am not understanding it even with the explanations and examples. I have three samples I hope you could tell me ho