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1 . A person has four iron bars whose lengths are 24 m, 36 m, 48 m and 72 m respectively. This person wants to cut pieces of same length from each of four bars. What is the least number of total pieces if he is to cut without any wastage?
[ A ]    10
[ B ]    15 right
[ C ]    20
[ D ]    25
Answer : Option B
Explanation :
24 = 12 × 2,
36 = 12 × 3,
48 = 12 × 4,
and 72 = 12 × 6
∴ HCF (24, 36, 48, 72) = 12
Total pieces = 2 + 3 + 4 + 6 = 15
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