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10 lusin = 10 x 12 lembar = 120 lembar
1250 + 120 = 1370 lembar
150 + 50 = 200lembar
1370 - 200 = 1170 lembar.
2. 15 lusin = 15 x 12 = 180 buah
2/5 x 180 = 2x36 = 72 buah
1 gros = 1 x 144 = 144
180 - 72 + 144 = 108 + 144 = 252 buah piring.
3. 3 1/4rim = 13/4x 500 = 13 x 125 = 1625 lembar
1625 + 20 = 1645 lembar
5 lusin = 5 x 12 = 60 lembar
1645 - 60 = 1585 lembar
1585 - 100 = 1485 lembar.
semoga membantu:)))