What must be subtracted from 21-7 to get 17-21-

Let the number be x, 21/7=15/7so 15/7 x =17/21 x=15/7 17/21 =28/21=4/3 In mixed fraction it can be written as X=11/3. Hence, if we subtract 28/21 from 21/7 , ...

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Byju's Answer

Standard VI

Mathematics

Inter Conversion of Mixed Fraction and Improper Fraction

What must be ...

Question

What must be subtracted from $2 \frac{1}{7}$ to get $\frac{17}{21}$ ?

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Solution

Let the number be $x$ ,
$2 \frac{1}{7} = \frac{15}{7}$
so $\frac{15}{7} - x = \frac{17}{21}$
$x = \frac{15}{7} - \frac{17}{21} = \frac{28}{21} = \frac{4}{3}$
In mixed fraction it can be written as $X = 1 \frac{1}{3}$ .
Hence, if we subtract $\frac{28}{21}$ from $2 \frac{1}{7}$ , we get $\frac{17}{21}$ .

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What must be subtracted from 217 to get 1721?

Let the number be x, 217=157so 157-x=1721 x=157-1721=2821=43 In mixed fraction it can be written as X=113. Hence, if we subtract 2821 from 217 , we get 1721.

What must be subtracted from $2 \frac{1}{7}$ to get $\frac{17}{21}$ ?