Lizzyloves8910
19.04.2020 •
Mathematics
A book store earned $235 in sales for 4 copies of a new cookbook and 5 copies of a new science fiction novel. The next day it earned $180 in sales for 3 copies of the cookbook and 4 copies of the science fiction novel. What was the price of each book?
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Ответ:
The cost of a cookbook is $40 and the cost of a science fiction book is $15.
Step-by-step explanation:
Given,
4 copies of cookbook and 5 copies of science fiction cost $235.
3 copies of cookbook and 4 copies of science fiction cost $180.
To find the cost of each cookbook and science fiction book.
Let us take
The cost of each cookbook is = x
The cost of each science fiction = y
According to the problem,
4x+5y = 235 (1)
3x+4y = 180 (2)
Multipy (1) by 3 and (2) by 4 and the subtract
(12x+15y) - (12x+16y) = 705 - 720
or, -y = - 15
or, y = 15
Now, putting the value of y in (1) we get,
4x = 235 -(5×15)
or, 4x = 160
or, x = 40
Hence,
The cost of a cookbook is $40 and the cost of a science fiction book is $15.
Ответ:
1/8
Step-by-step explanation:
white shirt= 1/4
tan pants= 1/2
white shirt and tan pants = 1/8