Sally wants to build a fence around her pool. the pool is 23 feet long by 21 feet wide. the fence is to be 15 feet from the edge of the pool. what are the outside dimensions of the area surrounding the pool? how many feet of the fencing will sally need?

Since the fence extends 15 feet from the pool on each side, each side of the fenced area will be 30 feeet longer than the side of the pool it is parallel to.

a) The dimensions of the fenced area are (30+23=) 53 feet by (30+21=) 51 feet.

b) The length of the fence is the perimeter of a rectangle 53 feet by 51 feet, so is (53+51+53+51) feet = 208 feet.

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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