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There were some animals on John's farm.

45% of the animals were cows.

Of the remainder, 40% were pigs and the rest were ducks.

The total number of cows and pigs was 850 more than the number of ducks.

(a) How many animals were there on John's farm?

(b) How many more ducks than pigs were there?

Notes to student:

If the question above has parts, (e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12