" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
2a+15b = 50
=========== --
-3b = -6
b = 2
2a = 44 - 12x2 = 20
a = 20/2 = 10
u20 = 10 + 2x19 = 48
s20 = 20/2 x (10+48) = 580