" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
1/10 = 1/si + 1/8
1/si = 1/8 - 1/10
1/si = 5/40 - 4/40
1/si = 1/40
si = 40 cm