Question
7 years ago from now, the ratio of ages of two siblings
was 9:8, respectively. 5 years hence from now, the ratio of ages of the younger sibling and the older sibling will be 4:5. Find the sum of their ages, 7 years hence from now.Solution
5 years hence from now, let the ages of the younger sibling and the older sibling be '4c' years and '5c' years, respectively. ATQ, 
So, the age of the older sibling, 7 years hence from now = 5c−5+7=5(3)−5+7 = 17 years. Age of the younger sibling, 7 years hence from now = 4c−5+7=4(3)−5+7 = 14 years. Therefore, the required sum = 17+14 = 31 years.
- Find the wrong number in the given number series.
8, 14, 24, 49, 59, 84 Find the wrong number in the given number series.
8, 12, 23, 40, 66, 103
174 180 198 252 414 910
640 1920 240 720 92 270
Find the wrong number in the given number series.
132, 147, 138, 155, 144, 161
1 3 7 15 33
...Find the wrong number in the given number series,
9, 60, 299, 1199, 3599, 7199
- Find the wrong number in the given number series.
32.6, 36.4, 40.2, 43.6, 47.8, 51.6 11 110 978 6824 34103 102290
- Find the wrong number in the given number series.
12, 21, 5, 38, 2, 71
