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Home/Practice questions/General Aptitude Test

General Aptitude TestQuantitative ReasoningAlgebra

If a - b = 9 and a2 + b2 = 305, then the value of ab is:

If a - b = 9 and

a² + b² = 305,

then the value of ab is:

Answer & explanation+

Correct answer: option 3

Given,

a - b = 9

a² + b² = 305

( a - b )² = a² + b² - 2ab

81 = 305 - 2ab

ab = 112

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