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"A' ഒരു ജോലി 20 ദിവസം കൊണ്ടും "B' അതേ ജോലി 30 ദിവസം കൊണ്ടും ചെയ്തുതീർക്കും. A യും B യും ഒരുമിച്ച് ആ ജോലി ചെയ്യുകയാണെങ്കിൽ എത്ര ദിവസം കൊണ്ട് ജോലി പൂർത്തിയാകും?

A10

B12

C20

D25

Answer:

B. 12

Read Explanation:

ആകെ ജോലി = lcm (20, 30) = 60 A യുടെ കാര്യക്ഷമത = 60/20 = 3 B യുടെ കാര്യക്ഷമത = 60/30 = 2 A+B യുടെ കാര്യക്ഷമത = (3 +2) = 5 A യും B യും ഒരുമിച്ച് ആ ജോലി ചെയ്യുകയാണെങ്കിൽ ജോലി പൂർത്തിയാക്കാൻ എടുക്കുന്ന സമയം = ആകെ ജോലി / കാര്യക്ഷമത = 60/5 = 12 ദിവസം


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