Question
Olivia put 156 eggs on some big trays and small trays. She put 7 eggs on each big tray and 5 eggs on each small tray. She used the same number of big trays and small trays. How many trays did Olivia use altogether?
4 m

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Olivia put 156 eggs on some big trays and small trays. She put 7 eggs on each big tray and 5 eggs on each small tray. She used the same number of big trays and small trays. How many trays did Olivia use altogether?