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The answer to the exercise book of the third grade of primary school mathematics published by People's Education Press is 62 pages.
Think of radish as a bridge.

Just ask from another angle (unify the number of carrots)

Note: 2 radishes for 8 carrots (2×5= 10 radishes for 8×5=40 carrots).

And because: 10 radishes can be exchanged for five Chinese cabbages.

Five Chinese cabbages can be exchanged for 40 carrots.

40÷5=8 means 1 Chinese cabbage can be exchanged for 8 carrots (⊙ _ ⊙).

8×4=32 (roots) Four Chinese cabbages for 32 carrots.

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