ansley81
30.12.2020 •
Mathematics
The cost of 5 books and 4 pens is 115. if the cost of 1 book is RS 15 ,find the cost of 7 pens
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Ответ:
The cost of 7 pens is RS 70
Step-by-step explanation:
Let c=the cost of one book and p=the cost of one pen
5b+4p=115
b=15
5(15)+4p=115
75+4p=115
4p=115-75
4p=40
p=40/4
p=10
7p=7*10
7p=70
The cost of 7 pens is RS 70
Ответ:
All you have to do is notice that 5 is a common factor of both 25 and 45. Divide both numbers by 5 and you get 5/9.