Self Maths Puzzle Verbal Ability

if world+trade=centre.then what is the value of centre?tell me in details ,pls sir/madam who ever may be.

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Self Other Question

what is 2 plus 2 A takes twice as much time as B or thrice as much time to finish a piece of work.Working together they can finish the work in 2 days.B can do the work alone in: