In an experimental study on friendliness and tipping, every alternate customer to whom the waiter is extra friendly toward are r
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[] The fractions are
[] I see that 21 is a multiple of 7, so this one will be simple to solve.
-> 21 / 7 = 3, so we can do the following:
[] Now they have a common denominator of <u>21</u>
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- Heather