Four apples,three oranges and five pears cost a total of K16.50 .If one apple cost K1.25 and one pears cost K1.15 , how much does one orange cost?

Let the cost of one orange be x.

Therefore, the total cost of the apples is 4 * K1.25 = K5.00
The total cost of the oranges is 3 * x = 3x
The total cost of the pears is 5 * K1.15 = K5.75

Given that the total cost of all the fruits is K16.50, we can write the equation:

5.00 + 3x + 5.75 = 16.50
8.75 + 3x = 16.50
3x = 16.50 - 8.75
3x = 7.75
x = 7.75 / 3
x = K2.58

Therefore, one orange costs K2.58.