Answer:176 psychology textbooks and 98 Biology textbooks were sold.
Step-by-step explanation:
Let x represent the number of psychology textbooks that were sold.
Let y represent the number of biology textbooks that were sold.
textbook store sold a combined total of 274 psychology and biology textbooks in a week. This means that
x + y = 274 - - - - - - - - - - -1
The number of psychology textbooks sold was 78 more than the number of biology textbooks sold. This means that
x = y + 78
Substituting x = y + 78 into equation 1, it becomes
y + 78 + y = 274
2y = 274 - 78
2y = 196
y = 98
x = y + 78 = 98 + 78
x = 176
Answer:
90
Step-by-step explanation:
18:
18*1=18
18*2=36
18*3=54
18*4=72
18*5=90
18*6=108
45:
45*1=45
45*2=90
45*3=135
Therefore, 90 is the correct answer
Answer:
4.5 lbs
Step-by-step explanation:
just divide 11.25 by 2.5
