Question

please solve all question shown in the figure.i m giving u 50 points. please help me i m in very trouble solve all question on a copy... please

Answer 1

X and Y be the two numbers
first equation:
x + Y = 4000
second equation ( remember 15% of a number means,15 times the number):
.15 x = .24y
isolate Y in the first equation
x+Y = 4000
Y=4000-x
substitute this into the second equation:
.15x=.25(4000-x)
distribute and solve for x :
.15x=1000-.25x
4x=1000
x=2500
substitute this into first equation written in term of Y :
Y=4000-x
Y=4000-(2500)
Y=1500

Answer 2

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x + y = 90
The second sentence tells us
y = 2x + 15
Now solve the first and substitute into the second
y = 90 - x and
90 - x = 2x + 15
75 = 3x
x = 25
y = 65