# Number System Questions pg10

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375 1. In a test,  for each correct answer, 1 mark is awarded and one mark is deducted for each wrong answer. When a boy answers all 20 items of the test and gets 8 marks, the number of questions answered correctly by him was
1. 14
2. 8
3. 16
4. 12

### Answer is a

2. The sum of the digits of a two-digit number is 10. If the number that is formed by reversing its digits is 18 less than the original number. Find the original number.

1. 16
2. 60
3. 64
4. 81

### Answer is c

3. A man ate 100 grapes in 5 days. Each day, if he ate 6 more grapes than those he ate on the earlier day. Find how many grapes did he eat on the first day?

1. 12
2. 76
3. 8
4. 54

### Answer is c

4. What decimal of a week is an hour?

1. 0.0062
2. 0.059
3. 0.062
4. 0.0059

### Answer is d

5. If the sum of a 2-digit number and therefore the number obtained by reversing its digits may be a square number. Find how many such numbers are there?

1.  6
2. 8
3. 5
4. 7

### Answer is b

Read More: Number System Concepts