An algebra problem by Mehdi Balti

Algebra Level 2

A boy scored 90 marks for his mathematics test. This was 20% more than what he had scored for the geography test.
How much did he score in geography?

100 50 75 180 72

Mehdi Balti by Mehdi Balti , 29, Pakistan

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1 solution

Md Omur Faruque
Oct 4, 2015

If he got x x marks in geography, then 120 % 120\% of x x is 90.

∴ 1.2 x = 90 \therefore 1.2x=90 ⇒ x = 90 1.2 = 900 12 = 75 \Rightarrow x=\frac{90}{1.2}=\frac{900}{12}=\color{#0C6AC7}{\boxed{75}}

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