2020 + <em>N</em> ≡ 0 (mod 11)
<em>N</em> ≡ -2020 (mod 11)
Notice that 2020 = 183 • 11 + 7, so
<em>N</em> ≡ -(183 • 11 + 7) (mod 11)
<em>N</em> ≡ -7 (mod 11)
<em>N</em> ≡ 4 (mod 11)
Subtract 59 from both sides, you get x=-179

number 3 is your answer x<-y+4/2-4
The dog weighs 17.48 pounds on Mars and 108.56 pound on Jupiter. Therefor, it will weigh 91.08 pounds less on Mars than on Jupiter.