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a:b a+b
3:7=10 30
30÷10=3
a= 3x3 =9
b=7x3= 21
a. 9
b.21-9= 12
Bil 1 = 3/10 x 30 = 9
Bil 2 = 7/10 x 30 = 21
A. 9
B. selisih 21-9 = 12