mixture problem

find the cost per kilo of a coffee mixture made from 8 kls of coffee that cost $90 pero kilo and 12 kls of coffee that cost $55 pero kilo.

thanks

Quote:

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Originally Posted by rcs

find the cost per kilo of a coffee mixture made from 8 kls of coffee that cost $90 pero kilo and 12 kls of coffee that cost $55 pero kilo.

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cost/kilo = $\displaystyle \frac{8 \cdot 90 + 12 \cdot 55}{8 + 12}$

8 kls = $90.00 = 90*8 =720--------- 1
12 kls = $55.00 = 55*12 = 660 --------- 2
Then the mixture of both is 20 Kls
Total of equation 1 & 2 is 1380
So , the mixture of 1 kls = (1380/20) = $69 / kls