The average age of the four girls is 20 years and their ages are in proportion 4:5:7:0. The age of the oldest girl is _____ years.
- 9
- 18
- 35
- None of these
Explanation
Let's solve it:
Let ages be 4x, 5x, 7x, 0x
Average age = 20 years
Sum of ages = 20 × 4 = 80 years
=> 4x + 5x + 7x + 0x = 80
=> 16x = 80
=> x = 5
Oldest girl's age = 7x = 7 × 5 = 35 years
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