alleryA ଏବଂ B ଏକତ୍ର ଏକ କାର୍ଯ୍ୟକୁ 12 ଦିନରେ ଶେଷ କରନ୍ତି। A ଏକାକୀ 20 ଦିନ ସମୟ ନିଏ। B ଏକାକୀ ନେବ:
A24 ଦିନ
B28 ଦିନ
C30 ଦିନ
D32 ଦିନ
Answer & Solution
Correct answer: C. 30 ଦିନ
1. ଏକତ୍ର ସେମାନେ ପ୍ରତ୍ୟେକ ଦିନ କାର୍ଯ୍ୟର ଏକ-ଦ୍ୱାଦଶାଂଶ ସମ୍ପୂର୍ଣ୍ଣ କରନ୍ତି।
2. A ଏକାକୀ ପ୍ରତ୍ୟେକ ଦିନ ଏକ-ବିଂଶତିତମାଂଶ ସମ୍ପୂର୍ଣ୍ଣ କରେ।
3. ତେଣୁ B ର ଦୈନିକ ଅଂଶ ହେଉଛି 1/12 - 1/20।
4. 60 କୁ ସାଧାରଣ ହର ଭାବରେ ନେଲେ, ତାହା ହେଉଛି 5/60 - 3/60 = 2/60, ଯାହା ଏକ-ତ୍ରିଂଶତମାଂଶ ଅଟେ।
5. ତେଣୁ B ଏକାକୀ 30 ଦିନ ଆବଶ୍ୟକ କରେ, ଯାହା A ତୁଳନାରେ ଯଥାର୍ଥ ଭାବରେ ଧୀର ଅଟେ।
_ଉତ୍ସ: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.3 Inverse Proportion_
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