a = 3 × b
12 = b × 2 ⇒ b = 12 : 2 ⇒ b = 6
a = 3 × 6 ⇒ a = 18
a + b = 18 + 6 ⇒ a + b = 24
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a = 3 × b
12 = b × 2 ⇒ b = 12 : 2 ⇒ b = 6
a = 3 × 6 ⇒ a = 18
a + b = 18 + 6 ⇒ a + b = 24