store sold 65 calculators making $3875 One was $15 and other was $67 . How many of each type did they sell ?
2007-09-06 06:11:34 · 4 answers · asked by kathy b 6 in Science & Mathematics ➔ Mathematics
a+b=65 so a=65-b
15a+67b=3875
15(65-B)+67B=3875
975+52b=3875
52b=2900 :| something is fishy i probably made a mistake
2007-09-06 06:31:33 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Let the number of calculators sold for $ 15 be x and those sold for $ 67 be y .
Then as the total number of calculators is 65, it follows that,
x+y = 65
=> x= 65 - y ----- equation 1
Now from the given info we can write an equation for the total sale:
15x + 67y = 3875 (this is derived from info given in the question)
Now substitute for x from equation 1
that gives
15( 65- y) + 67y = 3875
975 - 15y + 67y = 3875
52y = 3875 -975
as you can see y will be a decimal.
So the question given to you has some faulty data.
However the method is the same.
Find y in this method then substitute in equation 1 to find x and you will have your answer!
2007-09-06 06:27:30 · answer #2 · answered by Anonymous · 0⤊ 0⤋
x = 65 - y
15*x + 67*y = 3875
Plug in the first equation into x in the second equation (I solved for x for you). Then solve for y. Using y you can then calculate x from the first equation.
2007-09-06 06:17:25 · answer #3 · answered by Anonymous · 0⤊ 0⤋
No integral answer. Closest i 56*67+9*15 = 3887
2007-09-06 06:31:31 · answer #4 · answered by ironduke8159 7 · 0⤊ 0⤋