The daily rainfall data of a week is shown. (Note: 1 drop =4 inches)

(a) What is the total rainfall on Friday?
(b) What is the total rainfall on Friday and Saturday?
(c) What is the total rainfall on Friday, Saturday and Sunday?

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Solution

(a) If we observe the pictograph, there are 7 drops on Friday.
Given: Each drop represents 4 inches of rainfall.
Then, total rainfall on Friday is
$7 \times 4 = 28 i n c h e s$
(b) If we observe the pictograph, there are 2 drops on Saturday and 7 drops on Friday.
Given: Each drop represents 4 inches of rainfall.
Then, total rainfall on Friday and Saturday is $(2 + 7) \times 4 = 9 \times 4 = 36 i n c h e s$
(c) If we observe the pictograph, there are 2 drops on Saturday, 9 drops on Sunday and 7 drops on Friday.
Given: Each drop represents 4 inches of rainfall.
Then, total rainfall on Friday and on weekends is $(2 + 9 + 7) \times 4 = 18 \times 4 = 72 i n c h e s$

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