A cricket player after playing 10 tests scored 100 runs in the 11th test. As a result, the average of his runs is increased by 5. The present average of runs is
let his average of 10 matches = x
total runs in 10 matches = 10x
in 11th match he scored 100 runs, so
total runs after 11th match = 10x + 100
average of 11 matches = (10x+100)/11
after 11th match the average of his runs is increased by 5, so
 (10x+100)/11 = x+5
10x+100 = 11x + 55
x = 45
but present average = x+5 = 45+5 = 50
so the answer is option C.
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