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A+6/B+6 = 3/4
2x+6/3x+6 = 3/4
8x+24 = 9x + 18
x = 6
A = 2x = 12
B = 3x = 18
A+ B = 30
(a+6)/(b+6) = 3/4
(a+6)/(3/2a+6) = 3/4
4 (a+6) = 3 (3/2a+6)
4a+24 = 9/2a+18
24-18 = 9/2a-4a
6 = 1/2a
a = 12 -------------'---------- b= 3/2×12=18
jmlh umur agus dan beni skrng = 12+18
= 30