Fruit salad

The fruit salad is prepared from oranges and bananas. One kilogram of oranges costs 30 CZK and one kilogram of bananas costs 18 CZK. How many kilograms of bananas need to be added to half a kilogram of oranges to produce a fruit salad worth CZK 21 per 1 kg?

Correct result:

x =  1.5 kg

Solution:

18x + 30•0.5 = 21•(x+0.5)

18•x + 30•0.5 = 21•(x+0.5)

3x = 4.5

x = 3/2 = 1.5

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