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asli : 25x?m
25m = 2500cm
2500/15 = x/21 (x=lebar asli)
2500/5 = x/7
500 = x/7
3500 = x
lebar asli = 35m
atau
15/21 = 2500/x
5/7 = 2500 / x
5x = 17500
x = 3500
x = 35m
15cmxL = 2500cmx21cm
15cmxL = 52500cm
L = 52500cm/15cm
L = 3500cm
L= 35m