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If 72 ÷ 18 × 3² - 21 × 12 ÷ 3 + 12 = z, then find value of z.
Question

If 72 ÷ 18 × 3² - 21 × 12 ÷ 3 + 12 = z, then find value of z.

A.

-28

B.

-44

C.

-31

D.

-36

Correct option is D

Given: 

72 ÷ 18 × 3² - 21 × 12 ÷ 3 + 12 = z 

Concept Used: 

Operation preference wise

Symbol

Brackets

[], {}, ()

Orders, of

x (power), √ (root), of

Division

÷

Multiplication

×

Addition

+

Subtraction

-

Solution: 

72 ÷ 18 × 3² - 21 × 12 ÷ 3 + 12 = z 

4 × 3² - 21 × 4 + 12 = z 

36 - 84 + 12 = z

48 - 84 = z 

-36 = z 

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