How much tea at Rs4 a kg should be added to 15kg of tea at Rs10 a kg so that the mixture be worth Rs...........

Quantitative Aptitude ( CCS) Mixture and Alligation

How much tea at Rs4 a kg should be added to 15kg of tea at Rs10 a kg so that the mixture be worth Rs6.50 a kg?

Solution:
4 ……………….10
.. 6.5
3.5……………..2.5
21= 3*7 …….. 5*3=15

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