Once students are taught percentage and ratio, these 2 concepts can be presented in the same problem sum such as the one below.
Students must make use of the "repeated identity" method to solve.
Such questions are common in WA2 and SA2 of P5 exams.
Calculator usage is allowed.
There are oranges, pears and apples for sale at a fruit stall.
15% of the fruits at the stall are oranges.
The ratio of pears to apples at the stall is 12:5.
There are 150 more apples than oranges at the stall.
How many fruits are there altogether at the fruit stall?

If the above question is easy, try to do the more challenging question below.
The question below will randomize with different numbers every hour.