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Interesting math: learning by buying fruit? How to calculate?
Let coconut x apple y and orange 20 x y.

4x+0.5y+0.4(20-x-y)= 16.3

3.6x+0. 1y+8= 16.3

3.6x+0. 1y=8.3

When x= 1, y=47.

When x=2, y= 1 1.

When x=3, y=-25.

So x=2, y= 1 1, 20-x-y=7.

Answer: There are two coconuts, 1 1 apple and seven oranges.

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