Question
Risa has 30 more small pebbles than Natalie. How many small pebbles must Risa give Natalie so that Risa will have 18 more small pebbles than Natalie?
4 m

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Risa has 30 more small pebbles than Natalie. How many small pebbles must Risa give Natalie so that Risa will have 18 more small pebbles than Natalie?