Book Maths Puzzle

How many kg of wheat costing Rs.6.10 /kg must be mixed with 126 kg of wheat costing Rs.2.85/kg, so that 15% may be gained by selling the mixture at Rs.4.60/kg

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Book Other Question

What is the least number which when added to both the terms of the fraction 7/9 will give a ratio equal to 19/23? If a man can save Rs.5 more every year than he did the year before and if he saves 25 rupees in the first year after how many years will his savings be more than1000 rupees altogether and what will be the exact sum with him?