A machine produces $480$ bolts in $8$ hours. How many bolts will it produce in $13$ hours at the same rate?

A machine produces $480$ bolts in $8$ hours. How many bolts will it produce in $13$ hours at the same rate?
  1. $720$
  2. $760$
  3. $780$
  4. $800$

Solution

Rate $= \dfrac{480}{8} = 60$ bolts/hour. In $13$ hr $= 60 \times 13 = 780$ bolts.

Asked in: IMO

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