Question
PSLE
Some children are arranged in 4 rows. Each row has a more children than the row in front of it. There are 15a children in the second row. How many children are there altogether? Give your answer in terms of a in the simplest form.
2 m

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PSLE
Some children are arranged in 4 rows. Each row has a more children than the row in front of it. There are 15a children in the second row. How many children are there altogether? Give your answer in terms of a in the simplest form.