" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Verified answer
38 = { ( 5 × 36 ) + ( 10 × 37 ) + ( 10 × 38 ) + ( x × 39 ) + ( 5 × 40 ) } / ( 5 + 10 + 10 + x + 5 )38 = ( 180 + 370 + 380 + 39x + 200 ) / ( 30 + x )
38 ( 30 + x ) = 1130 + 39x
1140 + 38x = 1130 + 39x
1140 - 1130 = 39x - 38x
10 = x
jadi nilai x = 10