Multiple choice

A shopkeeper has three varieties of pulse costing 72 Rs/Kg, 60 Rs/Kg and 90 Rs/Kg. Find the possible ratio in which he should mix these three pulses to get a mixture worth 80 Rs/Kg.

  1. 4:3:2

  2. 12:7:15

  3. 5:1:6

  4. 21:7:29

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To get a mixture worth 80 Rs/Kg from three varieties costing 72, 60, and 90 Rs/Kg, we need to find a ratio where the weighted average equals 80. Using alligation or verification: (72×5 + 60×1 + 90×6) ÷ (5+1+6) = 960 ÷ 12 = 80. Option A (4:3:2) gives 77.5 Rs/Kg, Option B (12:7:15) gives 76 Rs/Kg, and Option D (21:7:29) gives 79.2 Rs/Kg - none of these work.

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