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$(2 : 3)$, $(5 : 7)$ ꯑꯃꯁꯨꯡ $(4 : 9)$ꯒꯤ ꯀꯝꯄꯥꯎꯟꯗ ꯔꯦꯁꯤꯑꯣ ꯑꯗꯨ ꯈꯪꯗꯣꯀꯎ꯫

A$30 : 91$
B$40 : 189$
C$50 : 201$
D$60 : 189$
Answer & Solution
Correct answer: B. $40 : 189$
**ꯄ꯭ꯔꯤꯟꯁꯤꯄꯜ.** $(a : b), (c : d), (e : f)$ꯒꯤ ꯀꯝꯄꯥꯎꯟꯗ ꯔꯦꯁꯤꯑꯣ ꯑꯁꯤ $(ace : bdf)$ꯅꯤ — ꯑꯦꯟꯇꯤꯁꯤꯗꯦꯟꯇꯁꯤꯡ ꯄꯨꯟꯅꯥ ꯃꯁꯤꯡ ꯌꯥꯃꯍꯅꯒꯗꯕꯅꯤ, ꯀꯟꯁꯦꯛꯌꯨꯟꯇꯁꯤꯡ ꯄꯨꯟꯅꯥ ꯃꯁꯤꯡ ꯌꯥꯃꯍꯅꯒꯗꯕꯅꯤ꯫ **ꯀꯝꯞꯌꯨꯠ ꯇꯧꯕꯥ.** ꯃꯃꯥꯡꯗꯥ ꯊꯣꯀꯈꯤꯕꯥ ꯊꯧꯗꯣꯀꯁꯤꯡ: $2 \times 5 \times 4 = 40$. ꯐꯂꯁꯤꯡ: $3 \times 7 \times 9 = 189$. ꯑꯗꯨꯅꯥ ꯔꯦꯁꯤꯑꯣ ꯑꯁꯤ $40 : 189$ ($\gcd(40, 189) = 1$ ꯑꯣꯏꯕꯅꯥ ꯍꯥꯟꯅꯗꯒꯤ ꯈ꯭ꯕꯥꯏꯗꯒꯤ ꯅꯦꯝꯕꯥ ꯇꯔꯃꯁꯤꯡꯗꯥ)꯫ **ꯀꯔꯤꯒꯤ ꯑꯣꯄꯁꯟ D (60 : 189) ꯑꯁꯤ ꯑꯔꯥꯅꯕꯥ ꯑꯣꯏꯔꯤꯕꯅꯣ.** ꯃꯁꯤꯅꯥ ꯃꯃꯥꯡꯒꯤ ꯄꯣꯠꯊꯣꯛ ꯑꯗꯨ ꯂꯥꯟꯅꯥ ꯂꯧꯏ (ꯈꯨꯗꯝ ꯑꯣꯏꯅꯥ $2 \times 3 \times 5$) — ꯃꯃꯥꯡꯒꯤ ꯑꯃꯁꯨꯡ ꯐꯂꯁꯤꯡ ꯑꯗꯨ ꯇꯣꯉꯥꯅꯕꯥ ꯀꯣꯂꯃꯁꯤꯡꯗꯥ ꯊꯝꯃꯨ꯫
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