Question

what should be added yo (10/20 +4/8 -9/18 to get 1
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Answer 1

Answer:  The required number to be added is $\dfrac{1}{2}.$

Step-by-step explanation:  We are given to find he number that should be added to the following expression to get 1 :

$E=\dfrac{10}{20}+\dfrac{4}{8}-\dfrac{9}{18}.$

Let the required number to be added be x.

Then, according to the given information, we get

$E+x=1\\\\\\\Rightarrow \dfrac{10}{20}+\dfrac{4}{8}-\dfrac{9}{18}+x=1\\\\\\\Rightarrow \dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{2}+x=1\\\\\\\Rightarrow \dfrac{1}{2}+x=1\\\\\\\Rightarrow x=1-\dfrac{1}{2}\\\\\\\Rightarrow x=\dfrac{2-1}{2}\\\\\\\Rightarrow x=\dfrac{1}{2}.$

Thus, the required number to be added is $\dfrac{1}{2}.$