a : b = 7 : 9 ഉം b : c = 15 : 7 ഉം ആണെങ്കിൽ, a : b : c എന്നത്:

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RRB Group D 2 Sept 2022 Shift 2 Official Paper
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  1. 21 : 35 : 45
  2. 35 : 45 : 21
  3. 45 : 35 : 21
  4. 35 : 45 : 25

Answer (Detailed Solution Below)

Option 2 : 35 : 45 : 21
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നൽകിയിരിക്കുന്നത്:

a : b = 7 : 9

b : c = 15 : 7

കണക്കുകൂട്ടൽ:

a : b = 7 : 9 ..................(1)

b : c = 15 : 7 ..................(2)

രണ്ട് സമവാക്യങ്ങളിലും b പൊതുവായുള്ളതിനാൽ, b യെ തുല്യമാക്കാൻ

സമവാക്യം (1) നെ 15 കൊണ്ടും സമവാക്യം (2) നെ 9 കൊണ്ടും ഗുണിക്കുക, നമുക്ക് ലഭിക്കുന്നത്

a : b = ( 7 x 15) : ( 9 x 15)

b : c = ( 15 x 9 ) : ( 7 x 9)

⇒ a : b = 105 : 135

⇒ b : c = 135 : 63

ഇപ്പോൾ, a : b : c = 105 : 135 : 63 = 35 : 45 : 21

അതിനാൽ, a : b : c എന്നത് 35 : 45 : 21 ആണ്.

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