A batsman scored 150 runs in his first three matches of a league. Calculate the average runs he must score in the next five matches to increase his average by 20 runs.
ATQ, Average after three matches = 150/3 =50 runs. Let the batsman score 'W' runs in the next five matches. 
5 13 36 145 719 4321
362 284 393 451 144 221
...76, 82, 158, 240, 398, 638, ?
104 136 152 160 164 ?
...49 84 119 154 189 ?
9 49 251 ? 2999 5989
...22 44 176 1078 8448
...13, 26, 104, ?, 13312, 425984
69 119 156 ? 199 209
Direction: Which of the following will replace ‘?’ in the given question?
342, ‘?’, 420, 462, 506, 552, 60
