Easy One

Number Theory Level 1

10 × 0.2 × 0.2 × 0.1 × 0.1 × 10 0.001 × 0.01 × 100 \frac { 10\times 0.2\times 0.2\times 0.1\times 0.1\times 10 }{ 0.001\times 0.01\times 100 } = ?

400 20 40 200

Aman Baser by Aman Baser , 21, India

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2 solutions

Anna Anant
Jan 2, 2015

[(10)(0.04)(0.01)(10)]/[(0.001)(0.01)(100)] = 0.04/0.001 = 4(10^-2)/(10^-3) = 4[10^(-2-(-3)] = 4[10^(-2+3)] = 4(10^1) = 4(10) = 40

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Parthi Ban
Jan 2, 2015

10 0.1=1. So upside 1 .2 .2 1=4. Downside .001*100=1 so 0.01

0.4/0.01 (which means 4/10 divided by 1/100. So its 40

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