Here radius = 19 cm
Slant height =11 cm
The condition for radius and slant height as r<l.
Lateral Surface Area = 
= 
= 656.59 square cm.
TO get 6% of 20 we have to write 6% in decimal (or fraction if u want but decimal allows u to multiply it easier i think)
6%=0.06=
Now u have to mulitply 0.06 times 20
0.06*20=1.2 - its the result
727.29 - 248.50 = 478.79
500-478.79 = 21.21
$21.21 is the least amount of money he needs to deposit
70 / 35 = 2
So the 70 pound dog weights double the weight of the 35 pound dog, so he will eat twice as much.
2 x 2.5 = 5 cups
Meaning he will eat 5 cups of dry dog food a day.
By the same logic a 140 pound dog would have to eat twice what a 70 pound dog eats, that is 10 cups of dry dog food a day, so 7 1/2 cups are not enough.
Challenge: per pound a dog eats more than a cat. Since you know a 140 pound dog eats 10 cups, you can dive 140 by 10, to find out that each cup feeds 14 pounds, so half a cup would be the amount of food to feed a 7 pound dog, meaning that a dog weighing 1 pound less than a 8 pound cat would need the same amount of food, so it eats more than a cat.
By adding all the numbers and dividing by 7 ( the amount of numbers) you know that the answer will be about 166.3
