A batsman has certain average in his 11 innings. He scores 90 runs in 12th inning, due to this his average decreased by 5 runs. Find his current average.

155 165 160 145

145

Let average be x Therefore, 11x + 90 = 12 (x - 5)                            x = 150 Therefore, current avg. = 150 - 5 = 145