What is the best deal on fabric?
a. 20 yards for $30.00
b. 40 yards for $45.00
c. 50 yards for $70.00
d. 65 yards for $85.00?

20 for $30 = 1 yard per $1.50
40 for $45 = 1 yard per $1.125 <<< best deal.
50 for $70 = 1 yard per $1.40
65 for $85 = 1 yard per $1.307

I believe 40 for 45 is the best one so b.

Where is the problems

I'll do the first one for you. it isn't very hard at all.on number one, you have (50 × 3), which equals 150, and (3 × 3), which equals 9. after you establish that, you add 150 and 9 together. so, (150 + 9) equals 159.this means that 53 × 3 = 159.