A packet has 15 marbles. Amar took some marbles and Ravi took 3 less than Amar. How many did each one of them get?
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Amar = y
Ravi = y-3
total marble = y+y-3 = 2y-3 = 15
2y = 15+3=18
y = 18÷2 = 9
Amar = 9
Ravi = 6
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