Book Maths Puzzle Numerical Ability

Three cubes each od edge 5cm are joined to form a cuboid. Find the total surface area of cuboid so formed(in cm2)

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ans: 350
l=15
b=5
h=5
surface area of cuboid=2(lb+bh+hl)
2(15*5+5*5+15*5)=350
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Book Other Question

log x - log y = log(x+y) then fing x Three vessels contain milk solutions with the concentrations of milk as 0.2,0.4,0.5 respectively.Solutions of five liters from the first, three from the second, two from the third are mixed. What is the ratio of milk and water in the resultent mixture?