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24 = 0,8 x A
A = 24 / 0,8 = 30
No.2
6,5 x 7,2 = 46.8
No.3
0,25 x A = 654
A = 654 / 0,25 = 2616
No.4
2,5 x A = 49
A = 49 / 2,5 = 122,5
2. 6,5 x 7,2 = 46,8
3. 65:0,25 = 260
4. 49:2,5 = 19,6