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reghanhoward3
28.12.2019 •
Mathematics
Uzezi buys 3 packets of washing powder a. and 5 packets of washing
powder b. and spends #4 900. uzezi has 3 packets of washing powder
b that is not needed and returns these to the shop and gets a full
refund. he also buys 6 further packets of washing powder a.
uzezi pays an #1740 in addition to the money received as refund.
how much does a packer of each washing powder cost:
a costs 600.
b costs 620
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Ответ:
A costs #711.5385
B costs #553.0769
Step-by-step explanation:
Let cost of powder A be x and powder B be y
When he’s given refund, equation can be written as
6x=1740+3y
6x-3y=1740 eqn 1
2x-y=870 making y the subject of the formula
Y=2x-870
Also, from the initial shopping
3x+5y=4900 eqn 2
Substituting the formula of y into eqn 2 we obtain
3x+5(2x-870)=4900
3x+10x-4350=4900
13x=4900+4350=9250
X=9250/13= 711.5385
Y=2x-870=2(711.5385)-870= 553.0769
Ответ:
Divide total price by number of cookies:
1.92/12 = 0.16
Each cookie cost $0.16