sum of the ages of 7 friends is a, then what is the sum of their ages after 5 years
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It's very obvious that age of an individual person will increase by 1 with every year.
Every year, sum of increased age of 5 people will be 5 years.
Every 5 years, sum of increased age of 5 people will be 5x5 = 25 years.
Based on above understanding,
sum of age of 5 people as of current year will be = sum of age of 5 people before 5 years + sum of increased age of 5 people in 5 years = 50 + 25 = 75 and after 5 years from current year, it will be 75 + 25 = 100 years.
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