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Mathematics

Grade-7

Easy

Question

A rectangular field scale drawing is 20 inches by 10 inches; the scale drawing is taken as 2 cm = 5 feet. Determine the area of the field in square feet.

250
500
750
900

hint Hint:

first we have to change inch to centimeter then centimeter to feet
we know 1inch = 2.54cm
and in question given 2cm=5feet

The correct answer is: 750

we know 1 inch = 2.54cm, so
Length = $l e n g t h space equals space 20 space i n c h e s l e n g t h space equals space 20 space cross times space 2.54 space equals space 50.8 c m bold italic i bold italic n bold space bold italic t bold italic h bold italic e bold space bold italic q bold italic u bold italic e bold italic s bold italic t bold italic i bold italic o bold italic n bold space bold italic g bold italic i bold italic v bold italic e bold italic n bold space bold 2 bold italic c bold italic m bold space bold equals bold space bold 5 bold space bold italic f bold italic e bold italic e bold italic t bold italic s bold italic o bold space bold 1 bold italic c bold italic m bold space bold equals bold space bold 5 over bold 2 bold space bold italic f bold italic e bold italic e bold italic t bold italic l bold italic e bold italic n bold italic g bold italic t bold italic h bold space bold equals bold space bold 50 bold. bold 8 bold italic c bold italic m bold italic l bold italic e bold italic n bold italic g bold italic t bold italic h bold space bold equals bold space bold 50 bold. bold 8 bold space bold cross times bold 5 over bold 2 bold space bold equals bold space bold 127 bold italic f bold italic e bold italic e bold italic t bold space bold. bold. bold. bold. bold. bold space bold left parenthesis bold italic a bold right parenthesis w i d t h space equals space 10 space i n c h space g i v e n w i d t h space equals space 10 space cross times space 2.54 space c m space equals 25.4 c m a n d space 1 c m space equals space 5 over 2 f e e t s o space bold italic w bold italic i bold italic d bold italic t bold italic h bold space bold equals bold space bold 25 bold. bold 4 bold space bold cross times bold 5 over bold 2 bold space bold equals bold space bold 63 bold. bold 5 bold italic f bold italic e bold italic e bold italic t bold italic n bold italic o bold italic w bold space bold italic w bold italic e bold space bold italic k bold italic n bold italic o bold italic w bold space bold italic t bold italic h bold italic e bold space bold italic a bold italic r bold italic e bold space bold italic o bold italic f bold space bold italic t bold italic h bold italic e bold space bold italic r bold italic e bold italic a bold italic c bold tan bold italic g bold italic l bold italic e bold space bold equals bold space bold italic l bold italic e bold italic n bold italic g bold italic t bold italic h bold space bold cross times bold space bold italic w bold italic i bold italic d bold italic t bold italic h bold italic a bold italic r bold italic e bold italic a bold space bold equals bold space bold italic l bold italic e bold italic n bold italic g bold italic t bold italic h bold space bold cross times bold italic w bold italic i bold italic d bold italic t bold italic h bold italic a bold italic r bold italic a bold italic e bold space bold equals bold space bold 127 bold space bold cross times bold space bold 63 bold. bold 5 bold italic a bold italic r bold italic a bold italic e bold space bold equals bold space bold 8064 bold. bold 5 bold space bold italic s bold italic q bold italic u bold italic a bold italic r bold italic e bold space bold italic f bold italic e bold italic e bold italic t$

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