Word Problem from Singapore PSLE 2021 (Primary School Leaving Examination) Paper 2 Q15

Helen and Ivan had the same number of coins. Helen had a number of $0.50 coins and sixty-four $0.20 coins. These coins had a mass of 1.134 kg. Ivan had a number of $0.50 coins and one hundred four $0.20 coins.

(a) Who has more money in coins and by how much?
(b) Given that each $0.50 coin is 2.7g heavier than a $0.20 coin, what is the mass of Ivan's coins in kg?

Primary School Leaving Examination: https://en.wikipedia.org/wiki/Primary_School_Leaving_Examination

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