Question

Rita has many rupees 100 notes and rupees 50 notes and total rupees 7000. of rupees 100 notes to rupees 50 notes is 5 is to 4 .how many of each type of notes does she have

Answer 1

consider X $100 notes and Y $50 notes
then X($100)+Y($50)=7000_____(1)
and also give X:Y=5:4=>X=5Y/4___(2)...(cross multiplied)
(2) in (1)
=>5Y/4(100)+Y50=7000
=>500Y+200Y=28000
=>700Y=28000
=>Y=40
put Y=40 in (2)
=>X=50
Hence she had 50 number if $100 notes and 40 number of $50 notes.
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