PSLE
Mr Sim used ⁷₉ of his money to buy 6 passion fruits and 4 mangosteens. The cost of 3 passion fruits was the same as that of 4 mangosteens. What was the most number of mangosteens that Mr Sim could buy with the money he had left?
Fraction of his money that he had left
= 1 - ⁷₉ 
= ²₉

Let the cost of 1 passion fruit be 1 P.
Let the cost of 1 mangosteen be 1 M.

3 P = 4 M _(x2)
6 P = 8 M

Since Mr Sim wants to buy mangosteens with the money he had left, 6 passion fruits will be substituted as 8 mangosteens.

⁷₉ of his money
= 6 P + 4 M
= 8 M + 4 M
= 12 M

⁷₉ of his money → 12 M
¹₉ of his money → ¹²₇ M
²₉ of his money → 2 x ¹²₇ M = 3³₇ M

Maximum number of mangosteens he could buy with the money that he had left = 3

Answer(s): 3