Question 886317
Say we have 3 friends: A, B, C


A:B:C = 1:2:5 which means 


Friend A has 1x dollars
Friend B has 2x dollars
Friend C has 5x dollars


for some unknown number x. The sum must add to $12,000, which means


1x+2x+5x = 12000


8x = 12000


x = 12000/8


x = 1500


-------------------------------------------------------


1x = 1*1500 = 1500


2x = 2*1500 = 3000


5x = 5*1500 = 7500


-------------------------------------------------------


Friend A gets <font color="red">$1,500</font>


Friend B gets <font color="red">$3,000</font>


Friend C gets <font color="red">$7,500</font>



Check: 1500+3000+7500 = 12000