Decimals and Fractions Practice Test 5

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Question : 11 of 30

Marks: +1, -0

Evaluate:

{2.11 ×21.1 -1.39× 13.9}/{ 21.1- 13.9 }

0.35
3.5
35
0.035
3.05

Solution:

{2.11 ×21.1 -1.39× 13.9}/{ 21.1- 13.9 }

={2.11 ×2.11×10 -1.39× 1.39×10}/{ 10(2.11- 1.39 ) }

={2.11 ×2.11 -1.39× 1.39 }/{ 2.11- 1.39 }

={(2.11)^2 -(1.39)^2 }/{ 2.11- 1.39 }

={(2.11+ 1.39) -(2.11- 1.39) }/{ 2.11- 1.39 }=3.5

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