Solve question no. 4 of page no. 84 from the chapter "Average" of textbook "Shaping Maths AB 5B Part I - Solutions".
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3 10 years = 30 years
The total age of Ali, Ben and Chandra is 30 years.
| 3 units | = | 30 years 6 years 9 years |
| = | 15 years |
| 1 unit | = | 15 years 3 |
| = | 5 years |
Chandra is 5 years old.