in an examination a got 10 marks less than b 25..., Percentage, General Mathematics

Question:In an examination, A got `10%` marks less than B, B got `25%` marks more than C and C got `20%` less than D. If A got `360` marks out of `500,` the percentage of marks obtained by D was :

A `70` 
B `75` 
C `80` 
D `85`

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+ AnswerC

+ Explanation`A = 90/(100) B, B`

`= 125/(100) C and C`

`= 80/(100) D`

`:. B = 10/9 A,`

`C = 4/5 B and D`

`= 80/(100) C.`

`B = 10/9 xx 360`

`= 400, C = 4/5 xx 400`

`= 320 & D`

`= 5/4 xx 320`

`= 400`

Percentage of D

`= (400/500 xx 100)%`

`= 80%`

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