A and B have some toffees. If A gives one toffee to B, then they have equal number of toffees. If B gives one toffee to A, then the toffees with A are double with B. The total number of toffees with A and B are __________.
12
Step 1: If A gives 1 to B: A − 1 = B + 1 ⇒ A = B + 2.
Step 2: If B gives 1 to A: A + 1 = 2(B − 1) ⇒ A = 2B − 3.
Step 3: Solving: B = 5, A = 7. Total = 12.
∴ 12
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