Q. A bill for Rs. 1,840 is paid in the denominations of Rs. 50, Rs. 20 and Rs.10 notes. 50 notes in all are used. Consider the following statements:
1. 25 notes of Rs. 50 are used and the remaining arc in the denominations of Rs.20 and Rs. 10.
2. 35 notes of Rs.20 are used and the remaining are in the denominations of Rs. 50 and Rs. 10.
3. 20 notes of Rs.10 are used and the remaining are in the denominations of Rs. 50 and Rs. 20.
Which of the above statements are not correct?
a. 1 and 2 only
b. 2 and 3 only
c. 1 and 3 only
d. 1, 2 and 3
Correct Answer: d. 1, 2 and 3
Question from UPSC Prelims 2022 CSAT Paper
Explanation :
A bill for 1840
Statement 1: 25 notes of Rs. 50 were used. So, remaining amount = 1840 – (25 × 50) = 1840 – 1250 = Rs. 590.
Even if all the remaining 25 notes are of Rs. 20 denomination, we will only get Rs. 500. So, Statement 1 is definitely incorrect.
Statement 2: 35 notes of Rs. 20 were used. So, remaining amount = 1840 – (35 × 20) = 1840 – 700 = Rs. 1140.
Even if all the remaining 15 notes are of Rs. 50 denomination, we will only get Rs. 750. So, Statement 2 is definitely incorrect.
Statement 3: 20 notes of Rs. 10 were used. So, remaining amount = 1840 – (20 × 10) = 1840 – 200 = Rs. 1640.Even if all the remaining 30 notes are of Rs. 50 denomination, we will only get Rs. 1500. So, Statement 3 is definitely incorrect.
