The table shows the heights of Anna, Evelyn, and Isaac. The average height of three children is 155 cm. The digit in the ones place of Anna's height and the digit in the tens place of Isaac's height are covered by ink blots.
- What is the digit in the ones place of Anna's height?
- What is the digit in the tens place of Isaac's height?
Total height of the three children
= 3 x 155
= 465 cm
Total height of Anna and Evelyn
= 465 - 116
= 349
349 - 170 - 100
= 79
= 7 tens 9 ones
(a) Digit in the ones place of Anna's height = 9
(b) Digit in the tens place of Isaac's height = 7
Answer(s): (a) 9; (b) 7