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2. 46,8..
3. 196
4. 19,6
a = 24/0,8
a = 30
6,5 x 7,2 = 46,8
0,25 x a = 49 (misalkan a)
a = 49/0,25
a = 196
2,5 x a = 49 (misalkan a)
a = 49/2,5
a = 19,6