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2 years ago

Cayenne bought 20 pencils for 1.60 dollars at that rate how much would 35 pencils cost

Mathematics

1 answer:

yanalaym [24]2 years ago

4 0

35 pencils would cost $2.80,

$1.60 / 20 = $.08
Each pencil costs $0.08 each

.08 * 35 = 2.80

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$5J +2S =12.20 ........(1)\\5J+10S=15.80......(2)\\Multiply \:equation \:(1)\:by\:the\:coefficient\:of\:x\:in equation\:(2)\\\\Multiply\:equation(2)\: by\: the\: coefficient\:of \:x\: in \:equation (1)\\\\5J +2S =12.20 ........(1) \times 5\\5J+10S=15.80......(2)\times 5\\\\25J+10S=61......(3)\\25J+50S = 79......(4)\\Subtract\:equation\:(4)\:from\: equation\: (3)\\-40S =-18\\\frac{-40S}{-40}=\frac{-18}{-40}\\ S = 9/20\\$

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3 years ago

Cayenne bought 20 pencils for 1.60 dollars at that rate how much would 35 pencils cost ​

Cayenne bought 20 pencils for 1.60 dollars at that rate how much would 35 pencils cost