P6 Math: Fractional Change with Ending Ratio

Questions like these appear in P6 Paper 2.
Usually 3 or 4 marks question.
Calculator usage is allowed.

Bala has $84 more than Ali at first.
After Bala spent 1/4 of his money and Ali spent 2/5 of his money,
the ratio of Bala's remaining money to Ali's remaining money is 3:1.

a) How much did Ali have at first?
b) How much did Bala have at the end?





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