danielajimenez24 danielajimenez24

19-09-2018
Mathematics

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A textbook store sold a combined total of 207 psychology and biology textbooks in a week. The number of biology textbooks sold was 59 less than the number of psychology textbooks sold. How many textbooks of each type were sold?

Respuesta :

19-09-2018

p+ b= 207
p-59= b

P+ (P-59)=207
2p-59=207:

2p =207+59
p=266/2
P=133
b=133-59
b=74
psych books= 133
biology books= 74
74+133= 207(Check)

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