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2015-07-01T21:52:46+05:30

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Let the required number of kilos of tea be x.
⇒According to the problem,
72x+10*90=78(10+x) ....(making the prices equal)
⇒72x+900=780+78x
⇒900-780=78x-72x
⇒120=6x
⇒x=120/6=20
Ans: 20 kilos of tea must be mixed .
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