Jawabanmu

2014-05-12T21:13:32+07:00
Panjang = 5/8 x 240 = 150
lebar     = 3/8 x 240 =   90
2014-05-12T21:14:51+07:00
Dengan bantuan n

panjang x lebar = luas
= 5n x 3n = 240
= 15n = 240
= n = 240/15
= n = 16

semoga membantu ^^
jadi
panjang = 5n = 5 x 16 = 80
lebar = 3n = 3 x 16 = 48