self Maths Puzzle

if 13+2=18
25+4=53
67+5=2
then
46+3=?

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self Other Question

(1/1*2)+(1/2*3)+(1/3*4)+(1/4*5)+ .............+(1/99*100)= pand q are the two points observed from the top of a building 10root3 m high.if the angle of depression of the points are complementary and pq=20 m then the distance of p from the buildling?