Knowing Our Numbers Quiz

The sum of the HCF and LCM of two numbers is 140. If the LCM is 28 more than 3 times the HCF, then find twice the HCF.

1. 36
2. 28
3. 56
4. 112

Answer: (c) 56

The average of 6 integers is -11. If four of them are -5, -12, 3 and 8, then determine the average of the remaining two integers.

1. -30
2. -20
3. -60
4. -66

Answer: (a) -30

There were 79,625 spectators on the first day of a cricket match, 53,562 on the second day and 80,223 on the third day. Find the total number of spectators on these three days, rounded to the nearest thousand.

1. 241,000
2. 213,000
3. 213,400
4. 214,000

Answer: (b) 213,000

Which of the following numbers is not coprime to 8?

1. 5
2. 7
3. 12
4. 9

Answer: (c) 12

Find the sum of the greatest 4-digit number and the number formed by reversing the digits of the number 3695.

1. 6963
2. 13694
3. 15962

Answer: (c) 15962

A shopkeeper loses $4 on each kilogram of apples sold and earns a profit of $8 on each kilogram of grapes sold. If he sold 16 kilograms of grapes, how many kilograms of apples must he sell to have no overall profit or loss?

1. 12 kg
2. 16 kg
3. 24 kg
4. 32 kg

Answer: (d) 32 kg

Rachel identified all the prime numbers between 25 and 55 and found their sum. She then subtracted this sum from the smallest four-digit number. What result did she get?

1. 719
2. 320
3. 1719
4. 281

Answer: (a) 719

For what least value of a is the number 52936a divisible by 22?

1. 0
2. 1
3. 2
4. 4

Answer: (d) 4

What should be subtracted from the sum of 24 and (-51) to get the largest negative integer?

1. -27
2. -26
3. 26
4. -1

Answer: (b) -26

The sum of four consecutive odd numbers is 48. Find the successor of the largest of them.

1. 9
2. 10
3. 15
4. 16

Answer: (d) 16