Just for the sake of quizzes

Algebra Level 1

What is 40% of the quantity obtained when 1200 is subtracted by 50% of 800?


The answer is 320.

Margaret Zheng by Margaret Zheng , 20, USA

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1 solution

⇒ 40 100 × [ 1200 − ( 50 100 × 400 ) ] \Rightarrow \dfrac{40}{100}×[1200-(\dfrac{50}{100}×400)]

⇒ 2 5 × [ 1200 − ( 1 2 × 400 ) ] \Rightarrow \dfrac{2}{5}×[1200-(\dfrac{1}{2}×400)]

⇒ 2 5 × [ 1200 − 400 ] \Rightarrow \dfrac{2}{5}×[1200-400]

⇒ 2 5 × 800 \Rightarrow \dfrac{2}{5}×800

⇒ 320 \Rightarrow \boxed{320}

3 Helpful 0 Interesting 0 Brilliant 0 Confused

Took me a few minutes to realize that the quotation marks meant something...

Manuel Kahayon - 5 years, 5 months ago

Nope! It's 50% of 800...not 400!

Akshay Krishna - 2 years, 7 months ago

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