Question 917030
 a merchant wishes to mix two kinds of peanuts costing $120 per kilo and $160 per kilo to obtain 140 kilos of mixture costing $240 per kilo.
 If the merchant wants the amount of the cheaper peanuts to twice that of the more expensive peanuts, how many kilos of each varieties should be.
:
This is impossible; the result cannot be worth more than the values of the ingredients.