rahul played weel in this season . his current batting averagge is 51 . if he score 78 runs in today match . his batting average will become 54 . how many matches had he played in this season .
"51 x + 78 = 54 ( x + 1 ) = > 3 x = 24 = > x = 8 answer : a"
divide(subtract(78, 54), subtract(54, 51))