Rohit scored an average of 58 runs in his last five innings. The runs scored by Rohit in the last four innings are 42, 56, 72, and 40. How many runs did Rohit score in the first of these five innings ?

80

Total runs scored in 5 innings = 5 × 58 = 290 runs

Sum of runs in 4 innings = 42 + 56 + 72 + 40 = 210

Runs in 5th inning = 290 - 210 = 80 runs