Book Maths Puzzle

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?

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Book Other Question

An elevator in a 12-storey building travels the rate of 1 floor every 15 seconds.At the ground floor and the top floor, the lift stops for 50 sec. How many round trips will the elevator make during a 5 (1/2) hour period 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