Exam Maths Puzzle Numerical Ability

If 𝒂𝒃 = 𝟐𝟑 and 𝒃𝒄 = 𝟒𝟓 , then (a + b) : (b + c) = ?

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Exam Other Question

4-5/1+1/3+1/2+1/4 Find the value of 𝟒+ 𝟒𝟒+ 𝟏𝟎𝟎𝟎𝟎=?