Jon makes a mix of salad that cost $15 using as much apples that cost $4/kg as oranges that cost $6/kg. How much of each fruit is in the salad?

Jon used 1.5 kg of apples and 1.5 kg of oranges. If 1 kg of apples cost $4, then 1.5 kg will cost $6. If 1 kg of oranges costs $6, then 1.5 kg of oranges will cost $9. $6 + $ 9 is equal to $15 which is the total Jon spent.

Let

x = number of apples.

y = number of oranges.

we have to write the following equation to represent the problem:

4x + 6y = 15

To satisfy the equation, Jon must have used

x = 2.25

y = 1

Substituting

4 (2.25) + 6 (1) = 15

9 + 6 = 15

answer

Jhon used 2.25kg of apple and 1kg of orange to make the salad.

Note: Since the problem does not have any other restrictions, there may be several apple and orange combinations that cost $ 15 per salad.