Singapore PSLE Math - Age Difference - Math is Van
Автор: Math with Van
Загружено: 2016-01-18
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Now you can master Singapore Primary School Math easily with this book: PSLE Mathematics guide to Word Problems – The only guide book that provides step-by-step detailed solutions and explanations for every word problem.
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At present, Mary is 4 times as old as her sister. In 20 years’ time, Mary’s age will be 14 years less than twice her sister’s age. How old is Mary now?
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