Robin kept a log of the number of hours she spent birdwatching during September and the cumulative number of birds she observed.
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Here is you're answer:
In order to cross multiply you have to multiply the numerator and denominator of the first fraction by the bottom number of the second fraction and see if the equation is still true:
- Solve if you like:
Therefore you're answer is "3 × 1 = 5 × 10."
Hope this helps!