What Comes Next in The Sequence: If 1 + 5 = 18; 4 + 20 = ?

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Solve this number series riddle and leave your answers in the comment section;


What Comes next in the sequence;

1 + 5 = 18

2 + 10 = 36

3 + 15 = 54

4 + 20 = ??

So were you able to solve the riddle? Leave your answers in the comment section below.

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