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Dividendo operation on a:b = c:d gives:
Aa:c = b:d
B(a+b):b = (c+d):d
C(a−b):b = (c−d):d
Db:a = d:c
Answer & Solution
Correct answer: C. (a−b):b = (c−d):d
1. Per OCR: "If a:b=c:d which implies a-b:b=c-d:d then we say that the operation of Dividendo is performed."
2. Subtract denominator from numerator on each side.
3. Often combined with Componendo as Componendo-Dividendo.
_Source: ICMAI BoS CMA Foundation Paper 3 (FBMS) — Paper3_07042026.pdf, Module 1 §1.1 (page 13)_