648.566 Km is the answer. :)
I hope this helps you
Circumference =2.pi.r
60=2.3,14.r
r=30/3,14
Arc Length = 140/360.2.3,14.30/3,14
Arc Length =70/3
Step-by-step explanation:
Let, 1st number be x and 2nd number be y
Then,
equation 1
x = 16+y
equation 2
x + y = 120
or, y = 120 - x
now,
x = 16 + y
or, x= 16 + 120 - x (putting the value of y from equation 2 )
or, x + x = 136
or, 2x =136
or, x= 136/2
or, x =68
Then,
y = 120-x
or, y= 120- 68 (putting the value of x)
or, y= 52
Hence, the two numbers are 68 and 52.
Ok so we start with 80 books and remove 50% so 40
2/5 of 40 is 16
16 books
