The table shows the heights of Olivia, Nathan, and Joseph. The average height of three children is 146 cm. The digit in the ones place of Olivia's height and the digit in the tens place of Joseph's height are covered by ink blots.
- What is the digit in the ones place of Olivia's height?
- What is the digit in the tens place of Joseph's height?
Total height of the three children
= 3 x 146
= 438 cm
Total height of Olivia and Nathan
= 438 - 134
= 304
304 - 130 - 100
= 74
= 7 tens 4 ones
(a) Digit in the ones place of Olivia's height = 4
(b) Digit in the tens place of Joseph's height = 7
Answer(s): (a) 4; (b) 7