Average (Activity 3)

Meiling spends $57 on some gifts

The average cost of gifts is $19

How many gifts are there?

Ans: ____

Mrs Tham spent $437on some pairs of shoes to donate to an orphanage

The average cost of each pair of shoes is $19

How many pairs of shoes did Mrs Tham buy?

Ans: ____

The average mass of 2 boys is 42 kg

The mass of one of the boys is 39 kg

What is the mass of the other boy?

Ans: ____ kg

The average cost of 3 greeting cards is $4

The total cost of 2 of the cards is $6.80

What is the cost of the third card?

Ans: $ ____

Aini, Bala & Caili picked up an average of 15 empty cans

Aini picked up 18 cans & Bala picked up 12 cans

How many cans did Caili pick up?
Ans: ____

The table shows the mark Jean gets in 3 subjects

How many marks did Jean get in English in order to get an average mark of 80 in the 3 subjects?

Ans: ____

The average of 4 numbers is 55

The average of 3 numbers is 52

What is the fourth number?

Ans: ____

The average height of a group of 3 children is 142 cm

A fourth child with a height of 146 cm joins the group

What is the average height of the 4 children now?
Ans: ____ cm