Home › CBSE Class 8 › Mathematics › Direct And Inverse Proportions › If 5 pens cost 50, then 8 pens cost:
If 5 pens cost 50, then 8 pens cost:
A70
B90
C60
D80
Answer & Solution
Correct answer: D. 80
1. Cost and number of pens are in direct proportion.
2. One pen costs 50 divided by 5, which is 10.
3. So 8 pens cost 8 times 10, which is 80.
4. The answer is 80.
_Source: NCERT Class 8 Mathematics, Ch 11 'Direct and Inverse Proportions'_
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