1.

A boy has Rs 728 in denomination of Rs 2 notes,Rs 5 notes and Rs 10 notes in the ratio of 3:2:4 respectively.What is the total number of notes he has?

Answer» Let the boy has `3x` 2 rupees notes.
Then, he will have `2x` Rs 5 notes and `4x` Rs 10 notes.
Total number of notes `= 3x+2x+4x = 9x`
Also, we are given,
`2(3x)+5(2x)+10(4x) = 728`
`=>6x+10x+40x =728=> 56x = 728`
`=> x = 13`
So, he will have total number of notes `= 9**13 = 117`


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