General Maths Puzzle Logical Reasoning

world + trade=center then c+e+n+t+e+r=?

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General Other Question

B D G
O Q R
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B C Q P
U R O C -
S Q P D - -
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O C U C Q P
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WAT IS THE CONCEPT BEHIND THIS TYPE OF QSTN. I DON'T UNDERSTAND DIS TYPE OF QUSTN. FROM WHERE I CAN EASILY UNDERSTAND THIS TYPE OF QUESTN PLZ SHARE LINK OR SOMETHING PLZ GUYS........
1 3 6 18 ? 244