Of the under-30s there for the second band, 40% are men because 100-60 = <<100-60=40>>40

There are fifty under-30s there for the second band because 20 / .4 = <<20/.4=50>>50

There are 100 people there to see the second band because 50 / .5 = <<50/.5=100>>100

There are 150 people at the concert because 100 / (2/3) = <<100/(2/3)=150>>150

# Answer

150
<|im_start|>system
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<|im_start|>user
April went to a concert that has two bands. 2/3 of the audience was there for the second band and 1/3 was there for the first band. 50% of the audience there for the second band is under the age of 30. Of this group, 60% are women and there are 20 men. How many people are at the concert?
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user
150
April went to a concert that has two bands. 2/3 of the audience was there for the second band and 1/3 was there for the first band. 50% of the audience there for the second band is under the age of 30. Of this group, 60% are women and there are 20 men. How many people are at the concert?
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