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13.let the rational no be x
A. To. Q
X(5/2)+2/3=-7/12
(15x+4)/6=-7/12
15x=-7/2-4
15x=-15/2
x=-1/2
14.let the no of 100,50,40 rs notes are be 2x,3x,5x respectively
Total cash she has=400000
100(2x)+50(3x)+10(5x)=400000
200x+150x+50x=400000
400x=400000
x=1000
So no of 100rs notes are 2000,50 are 3000and 10are 5000
15.let the no of 5rs coins be x
So no of 2 rs coins are 3x
Total coins=160
So no of 1rs coins are=
=160-3x-x
=160-4x
Toatal money she have=300
5x+2(3x)+160-4x=300
x+6x=300-160
7x=140
x=20
So 5rs coins=20
2rs coins=60
1rs coins=80
A. To. Q
X(5/2)+2/3=-7/12
(15x+4)/6=-7/12
15x=-7/2-4
15x=-15/2
x=-1/2
14.let the no of 100,50,40 rs notes are be 2x,3x,5x respectively
Total cash she has=400000
100(2x)+50(3x)+10(5x)=400000
200x+150x+50x=400000
400x=400000
x=1000
So no of 100rs notes are 2000,50 are 3000and 10are 5000
15.let the no of 5rs coins be x
So no of 2 rs coins are 3x
Total coins=160
So no of 1rs coins are=
=160-3x-x
=160-4x
Toatal money she have=300
5x+2(3x)+160-4x=300
x+6x=300-160
7x=140
x=20
So 5rs coins=20
2rs coins=60
1rs coins=80
mathupto12:
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