cts - a cricketer scores 23 runs and increases his average from 15 to 16 find the runs to be made if he wants top increase the avg to 18 in the same match - skillgun

Here The Cricketer's average is increase from 15 to 16 by scoring 23 runs in the match.if his average is 15 on that time his runs 15 in the match .So increasing average 1 he got 8 runs.Similarly if he get 39 runs then his average is 18.