alleryদুটা সংখ্যা 5 : 7 অনুপাতত আছে আৰু সিহঁতৰ অন্তৰ 12। সিহঁতৰ যোগফল হ'ল:
A60
B84
C96
D72
Answer & Solution
Correct answer: D. 72
1. সংখ্যা দুটাক 5x আৰু 7x বুলি ধৰা যাওক যাতে সিহঁতৰ অনুপাত 5 : 7 হৈ থাকে।
2. সিহঁতৰ অন্তৰ হ'ল 7x - 5x = 2x।
3. যিহেতু 2x = 12 দিয়া আছে, এটা ভাগ হ'ল x = 6।
4. সংখ্যা দুটা হ'ল 30 আৰু 42, গতিকে সিহঁতৰ যোগফল হ'ল 72।
5. একেদৰে যোগফল হ'ল 12x = 12 x 6 = 72।
_Source: syllabus Maths, Ch 7 'Comparing Quantities', S7.1 Recalling Ratios and Percentages_
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