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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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There were some girls and boys at a carnival at first. 40% of the girls and 10% of the boys left the carnival. As a result,
3/4 of the pupils remained at the carnival. There were 18 more boys than girls who remained at the carnival. How many girls were there at first?