alleryଗୋଟିଏ କାର୍ 60 km ଯାତ୍ରା କରିବା ପାଇଁ 4 litres ପେଟ୍ରୋଲ୍ ବ୍ୟବହାର କରେ। 12 litres ରେ ଏହା କେତେ ଦୂର ଯିବ?
A120 km
B180 km
C150 km
D240 km
Answer & Solution
Correct answer: B. 180 km
1. ଦୂରତା ଏବଂ ପେଟ୍ରୋଲ୍ ପ୍ରତ୍ୟକ୍ଷ ସମାନୁପାତରେ ଅଛି: ଗୋଟିଏ ବୃଦ୍ଧି ପାଇଲେ ଅନ୍ୟଟି ସମାନ ଅନୁପାତରେ ବୃଦ୍ଧି ପାଏ।
2. ପେଟ୍ରୋଲ୍ 4 litres ରୁ 12 litres କୁ ବୃଦ୍ଧି ପାଇଛି, ଯାହା ତିନି ଗୁଣ ଅଟେ।
3. ତେଣୁ ଦୂରତା ମଧ୍ୟ ତିନି ଗୁଣ ଅଧିକ ହେବ।
4. ତାହା ହେଉଛି 3 x 60 = 180 km।
5. ଅନୁପାତ ଯାଞ୍ଚ କଲେ, 60 / 4 = 180 / 12 = 15 km per litre, ଯାହା ସ୍ଥିର ରହେ।
_Source: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.2 Direct Proportion_
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