Fruit salad

A fruit salad for four. For the vitamin C we use rounded example numbers, because real fruit varies a lot: oranges have fifty milligrams in every hundred grams, strawberries sixty, apples five.

A fruit salad for $4$. Vitamin C per $100$ g (rounded examples only): orange $50$, strawberry $60$, apple $5$ mg.

Salad for $4$; mg per $100$ g: orange $50$, strawberry $60$, apple $5$.

Take four hundred grams of orange pieces, two hundred of strawberries and two hundred of apple. Mix gently, and add a spoonful of lemon juice so the apple does not go brown.

$400$ g orange, $200$ g strawberries, $200$ g apple; mix gently with a spoonful of lemon juice so the apple does not go brown. Total weight $400+200+200=800$ g.

Orange $400$ g, strawberries $200$, apple $200$: $400+200+200=800$.

The oranges give four times fifty, which is two hundred milligrams. The strawberries give twice sixty, a hundred and twenty. The apple gives twice five, ten. Altogether that is three hundred and thirty milligrams, or eighty-two and a half for each of the four bowls.

Orange $4\times 50=200$, strawberries $2\times 60=120$, apple $2\times 5=10$. Total $200+120+10=330$ mg, and per bowl $330÷4=82.5$.

$4\times 50+2\times 60+2\times 5=330$, and $330÷4=82.5$.

The surprise: by weight the apple is a quarter of the salad (two hundred out of eight hundred grams), but it gives only about three in a hundred of the vitamin C (ten out of three hundred and thirty). It is there to be crunchy.

Apple: $\frac{200}{800}=\frac{1}{4}$ of the weight but only $\frac{10}{330}\approx 3\%$ of the vitamin C. It is there to be crunchy.

Apple: $\frac{200}{800}=\frac{1}{4}$, but $\frac{10}{330}\approx 3\%$.