Things are not always what they seem.
To work out this problem it is necessary to have a look at the multiples of
5 and 8.
Multiples of 5 : 10-15-20-25-30
Multiples of 8: 16-24-32
The blue fabric costs $2 more than the green so : 5 yards x 6 = 30
The green fabric is $2 cheaper than the blue so: 8 yards x 4= 32
This amounts to 62 the total of the purchase.
The blue fabric costs $6 a yard and the green costs $ 4 .
I'd say the answer is 'the visible is more dangerous than the invisible', because Duncan never suspected that his faithful Macbeth would be the one to kill him.
