Maths olympiad Exam Numerical Ability Averages

If a batsman scored 44 runs in his last match, then his average runs increased by 0.2 runs.If he scored 4 runs in his last match ,then his average runs is decreased by 0.6 runs ,then what is the total match played by the batsman

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Maths olympiad Other Question

In driver's seat, 3 person can be seated.
3 people can be arranged in 3! ways.
Now, we have 4 seats left for 4 people.
4 people can be arranged in 4! ways.
Thus final answer = 3! × 4!
The tango is danced in pairs, one man and one woman. At a dance evening no more than 50 people
are present. At one moment 3/4 of the men are dancing with 4/5 of the women. How many people
were dancing at that given moment?
(A) 20 (B) 24 (C) 30 (D) 32 (E) 46