P6 Math: Fraction of Remaining with Before and After

Many P6 Math Paper 2 questions in Mid Year and Prelim exams makes use of 2 concepts learnt in P5.

Concepts such as "Fraction of Remaining" and "Before and After" and other ratio concepts are often combined to produce a question like the one below.

Such questions will appear in Paper 2.
Calculator usage is allowed.

In a farm, 2/5 of the animals were chickens.
9/10 of the remaining animals were pigs and the rest were ducks.
There were 112 more pigs than chickens at first.
After the farmer sold some of the chickens,
4/5 of all the animals left were pigs and ducks.

How many chickens were sold?

Animal Farm by George Orwell
All young adults should read this at least once


If the above question is easy, try to do the more challenging question below.

The question below will randomize with different numbers every hour. 
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