self Maths Puzzle

Five persons having ages in ascending order with exact difference of 5 years, decided to donate for a charity ,an amount equal to fifty times of their ages. The total donation was Rs 8750.Find the ages of five persons ?

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self Other Question

If the production cost in a certain company for first 1 lac item is Rs 20 lac and thereafter Rs 10 for each item. What is the minimum numbers of items that must be manufactured in order to get a cost of Rs 15 per item ? 18,30,49,78,__, __