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15 : 11 = 3x : (2x+2)
15(2x+2) = 11(3x)
30x + 30 = 33x
30 = 33x - 30 x
30 = 3x
10 = x
3. PQ = AB x DP + DC x AP : AD
= (7 x 3,5 + 3 x 3,5) : 7
= (24,5 + 10,5) : 7
= 35 : 7
= 5