Question
Tommy, Scarlett and Stella scored a total of 172 marks for their Chinese mock exam. Scarlett scored 50 marks. Stella scored 21 more marks than Scarlett. How many marks did Tommy score?
4 m

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Tommy, Scarlett and Stella scored a total of 172 marks for their Chinese mock exam. Scarlett scored 50 marks. Stella scored 21 more marks than Scarlett. How many marks did Tommy score?