DRDO Multi tasking staff Model paper 7

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Question : 74 of 100
 
Marks: +1, -0
In a cricket match, the ratio of runs scored by first four batsmen was 2 ∶ 3 ∶ 1 ∶ 5. Total 330 runs are scored in an inning and 80% of the runs are scored by top 4 batsmen only. How many half-centuries are scored in that innings if the last batsman scored 18 runs?
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