Let x = the number of boxes sold on Monday.
x + x - 3 = 15
2x = 18
x = 9
9 * 12 = ?
A Shopkeeper sold a total of 15 boxes of pencils on Monday and Tuesday. He sold 3 more boxes on Monday than on Tuesday. There were 12 pencils in each box. How many pencils did he sell on Monday?
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