Key in each average

Exercise and reference answers

Questions

1. Answer

   15

   Question

   Average of 5, 10, 15, 20 and 25?

2. Answer

   3

   Question

   Average of the first five natural numbers?

3. Answer

   43

   Question

   30 students average 12 years. With the teacher it is 13. Teacher's age?

4. Answer

   48

   Question

   Half a journey at 40 km/hr, half at 60 km/hr. Average speed in km/hr?

5. Answer

   56

   Question

   Eleven numbers average 50; the first six average 49 and the last six 52. The sixth?

Instructions

Work each average out, then key the plain number into the pad with no unit attached.

Explanation