self Maths Puzzle

if 20+15+9+6=50 then why (50-20)30+(30-15)15+(15-9)6+(6-6)0=51?

Read Solution (Total 2)

nos are 105, 140,175 .
11 years agoHelpfull: Yes(0) No(2)

plz explain it
11 years agoHelpfull: Yes(0) No(0)

self Other Question

what are the numbers between 101 and 199 which are exactly divisible by 5 or 7? A man,whose walking speed is 15 km/hr on escalator and escalator is being fixed to 30 km and it is moving horizontally with the velocity of 25km/hr and a man has to take his watch. so, find The time taken by that person to reach his destination (in km/hr) is