Jo has twice as many $2 notes as $10 notes. If he has $84,

[tom25]

hi i need help for the following question:

Jo has twice as many $2 notes as $10 notes. given that he has a total amount of $84. how many $10 notes does he has?

tks.

 

[soroban]

Re: please i need help

Hello, tom25!

Joe has twice as many $2 notes as $10 notes.
Given that he has a total amount of $84, how many $10 notes does he have?

$\displaystyle \text{Let }x\text{ = number of \$10 notes.}$
. . $\displaystyle \text{They have a value of: }10x\text{ dollars.}$

$\displaystyle \text{Then }2x\text{ = number of \$2 notes.}$
. . $\displaystyle \text{They have a value of: }2(2x) \:=\:4x\text{ dollars.}$

\(\displaystyle \text{The total amount is \$84: }\:10x + 4x \;=\;84 \quad\hdots\quad There!\)

$\displaystyle \text{Solve for }x\!:\;\;14x \:=\:84 \quad\Rightarrow\quad x \:=\:6$


$\displaystyle \text{Therefore, Jo has }{\bf6}\text{ ten-dollar notes.}$

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Check

$\displaystyle \begin{array}{cccc} \text{six \$10 notes} & = & 60 \\ \text{twelve \$2 notes} &=& 24 \\ \hline \text{Total}& & 84 \end{array}$

 

[Denis]

Re: please i need help

Tom, do you skip math classes or something?

 

[tom25]

Re: please i need help

tks......
i used to attend school long long ago.
now trying to go back to school & find myself a bit slow & rusty.