The table shows the heights of Grace, Natalie, and Matthew. The average height of three children is 141 cm. The digit in the ones place of Grace's height and the digit in the tens place of Matthew's height are covered by ink blots.
- What is the digit in the ones place of Grace's height?
- What is the digit in the tens place of Matthew's height?
Total height of the three children
= 3 x 141
= 423 cm
Total height of Grace and Natalie
= 423 - 147
= 276
276 - 140 - 100
= 36
= 3 tens 6 ones
(a) Digit in the ones place of Grace's height = 6
(b) Digit in the tens place of Matthew's height = 3
Answer(s): (a) 6; (b) 3