alleryStart learning →A purse has 12 banknotes, each ₹10 or ₹20, totalling ₹180. How many are ₹20 banknotes?
A9
B3
C8
D6
Answer & Solution
Correct answer: D. 6
Let n be the number of ₹20 notes; then 12−n are ₹10 notes. Thus 20n+10(12−n)=180, giving 10n=60 and n=6.
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