Discussion
A waiter's income consists of his salary and tips. During one week his tips were 5/4 of his salary. What fraction of his income came from tips ?
Answer: D
Correct answer: 5/9
Take the salary as 4 units, so the tips are 5 and the income is 9. The tips are therefore \[ \frac{5}{9} \] of the income. The trap is 5/4, which is the ratio of tips to salary as given rather than to income - the denominator must be the whole, not the other part.
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