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September 18, 2014

September 18, 2014

Posted by **Loren** on Tuesday, January 29, 2013 at 3:09pm.

- algebra -
**Reiny**, Tuesday, January 29, 2013 at 5:09pmAre we assuming something like

mix 2 L of water at 60° with 2 L of water at 80° we will have 4 L of water at 70° ?

Perhaps a physics teacher could shed some like on this

If this is valid then

90x + 40(30) = 75(x+30)

90x + 1200 = 75x + 2250

15x = 1050

x = 70

70 gallons of the hot water must be added

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