Answer:
1 new and 5 used
Step-by-step explanation:
If we subtract multiples of 250 from 625 and divide by 75, we can determine the number of phones.
We know that 250(2) = 500; if we subtract this from 625, this leaves
625-500 = 125 for the old phones. Dividing this by 75, we see that it is not a whole number; this means there cannot have been two of the new $250 phones sold.
625-250 = 375. Dividing this by 75, we get 5; this means 1 new phone and 5 old were sold.
The no. of new phone sold is 1 and the no. of old phone sold is 5.
Given,
A new phone sells for [tex]\$ 250[/tex] and a used one sells for [tex]\$75[/tex].
Let [tex]x[/tex] new phone is sold and [tex]y[/tex] old phone is sold for the day.
Here the total profit for the day is [tex]\$625[/tex].
So,
[tex]250x+75y=625[/tex]
Or,
[tex]10x+3y=25........(1)[/tex]
Now the value of [tex]x[/tex] and [tex]y[/tex] satisfy the above equation, if we take [tex]x=2[/tex] and more than [tex]2[/tex], it is clear that it not satisfy the above equation. So we made a conclusion here [tex]x[/tex] must be equal to 1 here.
So, at [tex]x=1[/tex],
[tex]10+3y=25[/tex]
[tex]3y=25-10[/tex]
Or,
[tex]y=5[/tex]
Hence The no. of new phone sold is 1 and the no. of old phone sold is 5.
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https://brainly.com/question/14352292
