Question

how many kilos of potatos worth ₹5 per kg be mixed with 10kg of potatoes worth ₹8 per kg to make a mixture which will cost ₹6 per kg?​

Answer 1

Answer:

Add x kg of tea at $ 72/kg with 10 kg of tea at $ 90/kg.

72x + 10*90 = (x+10)*78

72x + 900 = 78x + 780, or

6x = 120, or

x = 20.

So add 20 kg of inferior tea to every 10 kg of superior tea to get a mixture of sub-standard tea worth $ 78/kg.

Check: [(20*72)+(10*90)]/30 = [1440+900}/30 = 2340/30 = 78. Correct.

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