Judith is digging for sandstone at a geological site. She has 160 m of rope and four steaks to mark off a rectangular area. Whic
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Let:
x = Chemistry textbooks sold
y = Physics textbooks sold
The textbook store sold a combined total of 260, so:
The number of chemistry books sold was three times the number of physics textbooks sold, so:
Let:
Replace (2) into (1):
Replace the value of y into (2):
5 x 0.4 = 2 and 
= 1.4142....... which is an irrational number