anonymous
  • anonymous
Pump 1 takes 7minutes to fill my 20 gallon gas tank. Pump 2 takes 13 minutes to fill my tank. How long would it take if I could use both tanks at the same time?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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dumbcow
  • dumbcow
\[\frac{20}{7}x + \frac{20}{13}x = 20\] add fractions 7*13 = 91 \[\frac{(20)(13)x + (20)(7)x}{91} = 20\] multiply 91 on both sides add like terms \[400x = 1820\] \[x = 4.55\]
anonymous
  • anonymous
ok i understand the answer but not understanding the directions plz make them clearer
anonymous
  • anonymous
is answer coorect?

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anonymous
  • anonymous
dont know
dumbcow
  • dumbcow
for pump 1 we need to find the rate of gall/min ->20/7 pump 2 rate is 20/13 gal/min if we multiply this rate by time we get a num of gallons this time is represented by x, the amount of time to fill up using both pumps total num of gallons needed is 20 so it equals 20
anonymous
  • anonymous
ok gotcha
anonymous
  • anonymous
i just have to explain in detail how i got my answer and show my work just alittle confused on your work

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