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Question

Answer

John :
168 – 1u ——- 5p
504 – 3u ——- 15p

His sister :
168 – 18 = 150
150 – 1u ——- 3p
750 – 5u ——- 15p

5u – 3u = 2u ——- 750 – 504 = 246
1u ——- 123

Ans : $123.

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Similar question in link to identify same difference before and after, but in above question, some changes to info and analysis: https://www.kiasuparents.com/kiasu/question/34016-2/

Identify difference between John and Sister did not change because each spent same amt of $. Make their difference before and after equal so means 2u=$18 (only after detailing basic info in table below).

  John Sister Total
At first $168            168-18=$150      $18 (#2. deduce=2u)
Spent

$same spent 

(#4a. calculate diff $123)

$same spent

(#4b. checked diff $123)

 
End ratio 5                  (#3a. $45) 3           (#3b. $27) 2      (#1. make 2u)
      Follow steps#

2u —> $18

1u —> $9,

5u —> $45

3u —> $27

Answer is John (and his sister) spent $123 (each)#

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