A coffee shop mixes Brazilian worth 5 per kilogram with Turkish 8 The mixture is to sell for 7 How much of the should be used mak?

Let x kg of Brazilian coffee be used. Then, (10 - x) kg of Turkish coffee will be used.

Cost price of Brazilian coffee = 5x

Cost price of Turkish coffee = 8(10 - x)

Total cost price = 5x + 8(10 - x)

= 5x + 80 - 8x

= -3x + 80

Selling price of the mixture = 7(10) = 70

Profit = Selling price - Cost price

= 70 - (-3x + 80)

= 70 + 3x - 80

= 3x - 10

For making profit, Profit > 0

=> 3x - 10 > 0

=> 3x > 10

=> x > 10/3

=> x > 3.33

Therefore, more than 3.33 kg of Brazilian coffee should be used.