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primary 6 | Maths
| Data Analysis
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30T + 6 = 12 ( T + 26 )
30T + 6 = 12T + 312
18T = 306
T = 17
So he bought 17 Trays = 510 plus 6 more for 516 eggs total
( 516 eggs / 12 per carton = 43 carton, 17 + 26 = 43 QED)
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