Question

a b c and d go for a picnic. when a stands on a weighing machine b also climbs on and the weight shown was 132 kg. when b stands c also climbs on and the machine shows 130 kg. similarly the weight of c and d is found as 102 kg and that of b and d is 116 kg. what is d's weight?

Answer 1

a+b=132. 1
b+c=130. 2
c+d=102. 3
b+d=116. 4

subtract eq( 4)-(3)
b-c=14. 5
add 5th and 2nd
2b=144

【b=72 kg】

put weight of b in eq 4th
then 【d=44 kg】

put weight of d in eq. 3rd
then 【c=58 kg】

put weight of b in eq.1
then 【a=60 kg】

Answer 2

Answer:

d=44kg.

Explanation:

a+b=132------>1

b+c=130------>2

c+d=102------>3

b+d=116------->4

add (2),(3)&(4) , we get

2b+2c+2d=348.

b+c+d=174.------>5

subtract (2) from (5)

b+c+d=174.

-b-c    =-130.

       d=44

_________

so, d=44.