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384 divides by 16 on paper = 24
One.
The HCF of the given two numbers is 24
Whatever you do to one side of the equation (equals sign), you must do to the other: 43 - b = 24 ⇒ 43 - b + b = 24 + b ⇒ 43 = 24 + b ⇒ 43 - 24 = 24 + b - 24 ⇒ 19 = b So b is 19.
The factors of 24 are: 1, 2, 3, 4, 6, 8, 12, 24