Tried an approach different from the traditional one: (30 second approach)

40 male have avg of 35 and the mean is 39.

Difference = 39-35 = 4

This difference of '4' has to be compensated by additional value of 10 elements(females)

so additional value * 10 = 4*40

additional value = 16

average age of females = mean + additional value= 39+16 = 55

--E--

Let me know if you have any query

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"Trust the timing of your life"

Hit Kudus if this has helped you get closer to your goal, and also to assist others save time. Tq