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RAKESH KUMAR

· started a discussion

· 1 Months ago

plz help (Question: 233431.0 )

how to avoid this lengthy calculation
any short tricks?

Question:
A rectangular field is 161m long and 136 m wide. There should be a path all around a field of equal width. If the area of path is 1204 m2, then the width of path is
Options:
A) 1 m
B) 5 m
C) 2 m
D) 5.5 m
Solution:

Ans: (c)

Rachit Yadav

· commented

· 1 Months ago

161-2a* 136-2a=last digit4 only 2 satisfies

Rachit Yadav

· commented

· 1 Months ago

solve by option only options has last digit so answer is2

Mohisin khan

· commented

· 1 Months ago

Yet to be approved!

Ganesh Choudhary

· commented

· 1 Months ago

Initial Area = 161*136 = last digit will be 6,
Now if we increase the length and width according to each option
then given that
outer area - inner area = area of path
outer area - a number whose last digit is 6 = 1204
so last digit area must be 0,
now use options
option A, 163*138 = last digit will be 4
option B, 171*146 = last digit will be 6
option C, 165*140 = last digit will be 0
option D, 172*147 = last digit will be 4
So the correct option is C.

Rajesh Kumar

· commented

· 1 Months ago

(l+b+2x)*2x=area,(161+136+2x)2x=1204 after this use hit & trial method using options
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