Question
Every box of small pebbles contains 18 grey small pebbles and 39 silver small pebbles. How many more silver small pebbles than grey small pebbles are there in 4 such boxes?
4 m

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Every box of small pebbles contains 18 grey small pebbles and 39 silver small pebbles. How many more silver small pebbles than grey small pebbles are there in 4 such boxes?