Three times the larger of two numbers is equal to four times the smaller. The sum of the numbers is 21 . Find the number

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11-01-2015
Mathematics

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Three times the larger of two numbers is equal to four times the smaller. The sum of the numbers is 21 . Find the number

Sagot :

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Sandiswimsidn Sandiswimsidn · Answer 1 · 2015-01-11T17:32:19-05:00

Sandiswimsidn Sandiswimsidn

11-01-2015

two numbers equal 21
x+y=21
x<y
3y=4x
y=4x/3
x+4x/3=21
7/3x=21
7x=63
x=9
9+y=21
y=12

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Luanaidn Luanaidn · Answer 2 · 2015-01-11T17:32:19-05:00

Luanaidn Luanaidn

11-01-2015

[tex]x,y-\ two\ numbers\ , x-\ smaller\\\\ x+y=21\ \ \ \ | x=21-y\\ 3y=4x\\\\ 3y=4(21-y)\\\\ 3y=84-4y\ \ \ | add\ 4y\\\\ 7y=84\ \ \ \ | divide\ by\ 7\\\\ y=12\\\\ x=21-12=9\\\\ Smaller\ number:\ 9\\\\ Larger \ number:\ 12[/tex]

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