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There were 2/3 as many children as adults on a bus. When 12 children got off the bus and 12 adults boarded, the number of children became 1/9 the number of adults on the bus. How many adults were on the bus at first?

 Apr 19, 2021
 #1
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c = 2/3 a

 

then

 

c -12  =  1/9 (a+12)    sub in the red equation  

2/3 a  - 12 = 1/9a + 12/9

a = 24 originally

 Apr 19, 2021
edited by ElectricPavlov  Apr 19, 2021

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