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Mathematics 7 Online
OpenStudy (anonymous):

The Sears Tower in Chicago is the tallest building in the USA. On a sunny day, the Sears Tower casts a shadow that is 2908 feet long. A 5 foot person standing by the building casts a 10-foot-long shadow. How tall is the Sears Tower in feet?

OpenStudy (jamesj):

still here?

OpenStudy (jamesj):

Ok, so if a 5 foot tall person casts at 10 foot shadow, how long a shadow would a 3 foot child cast?

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

6 feet

OpenStudy (jamesj):

Right. Hence a 20 foot shadow comes from an object how tall? ____ feet

OpenStudy (anonymous):

40

OpenStudy (jamesj):

No.

OpenStudy (jamesj):

5 foot person -> 10 foot shadow 3 foot person -> 6 foot shadow ___ foot object -> 20 foot shadow

OpenStudy (anonymous):

ohh 10

OpenStudy (jamesj):

Right. Hence for the Sears Tower ___ foot building -> 2908 foot shadow

OpenStudy (anonymous):

i misunderstood

OpenStudy (anonymous):

ok, 1454

OpenStudy (jamesj):

Yes

OpenStudy (anonymous):

so its 1454 ft

OpenStudy (jamesj):

Yes

OpenStudy (anonymous):

thx

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