The question below deals with the ratio concept of only one party change.
Good practice for both P5 SA2 and P6 students.
Such questions usually appear in Paper 2.
Calculator usage is allowed.
Ben and Lenny have some cards.
At first, the number of cards that Ben have to
the number of cards that Lenny have was 1:5.
After Ben bought 18 more cards,
the ratio of Ben's cards to Lenny's cards became 1:2.
How many cards did they have altogether at first?
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