Explanation

The prime numbers between 60 and 80 are:

61, 67, 71, 73, and 79

Let's add them up:

61 + 67 = 128

128 + 71 = 199

199 + 73 = 272

272 + 79 = 351

Last updated by NA on 05-11-2026

Explanation

Sum:

2+3+5+7+11+13+17+19=77

Correct Answer: 77

• Prime numbers are divisible only by 1 and themselves.

• 1 is not a prime number.

  
  

  Last updated by NA on 04-11-2026

Explanation

120 men can do work = 30 days

1 man can do this work = 120 x 30 = 3600 days

80 men can do this work = 3600/80 = 45 days

Last updated by NA on 04-11-2026

Explanation

The prime numbers less than 25 are: 2, 3, 5, 7, 11, 13, 17, 19, and 23.

Let's add them up:

2 + 3 = 5

5 + 5 = 10

10 + 7 = 17

17 + 11 = 28

28 + 13 = 41

41 + 17 = 58

58 + 19 = 77

77 + 23 = 100

So, the sum of prime numbers less than 25 is: 100

Last updated by NA on 04-11-2026

Explanation

To calculate the average (or mean) of a data set, you use the formula:

Average=Sum of all values/Number of values​

Given:

• The sum of all 10 values in the data set is 10.
• The number of values is 10.

Using the formula:

Average=10/10​=1

$$Last\; updated\; on\; 30\; Oct\; 2026$$