The table shows the heights of Jack, Grace, and Henry. The average height of three children is 142 cm. The digit in the ones place of Jack's height and the digit in the tens place of Henry's height are covered by ink blots.
- What is the digit in the ones place of Jack's height?
- What is the digit in the tens place of Henry's height?
Total height of the three children
= 3 x 142
= 426 cm
Total height of Jack and Grace
= 426 - 131
= 295
295 - 150 - 106
= 39
= 3 tens 9 ones
(a) Digit in the ones place of Jack's height = 9
(b) Digit in the tens place of Henry's height = 3
Answer(s): (a) 9; (b) 3