Question

what rational number should be subtracted from the sum of 3 upon 4 3 and minus 4 upon 7 to get 13 upon 21 ​

Answer 1

Answer:

-41/42

Step-by-step explanation:

Sum of 3/14 and-4/7:-

⇒ 3/14+(-4/7)

= 3/14 - 4/7

take lcm for 7 & 14

= 3/14-8/14

= (3-8)/14

= -5/14

Let the number be 'x'

-5/14 - x = 13/21

x = -5/14-13/21

take lcm for 14 & 21

x = -15/42-26/42

x = (-15-26)/42

x = -41/42

hence,

-41/42 should be subtracted from the sum of 3/14 and -4/7 to get 13/21.

Answer 2

Question

What rational number should be subtracted from the sum of 3/14 and -4/7 to get 13/21?

$\frac{-41}{42}$ is subtracted from the sum of 3/14 and -4/7 to get 13/21.

Given:

The rational numbers are 3/14 and -4/7.

To Find:

The unknown value Z.

Solution:

Let Z be the unknown number.

Sum of 3/14 and -4/7 is

$=\frac{3}{14}+ \frac{-4}{7} \\\\= \frac{3 -8}{14} \\\\= \frac{-5}{14}$

Z is subtracted from -5/14 to give 13/21

$\frac{5}{14} -Z= \frac{13}{21} \\\\Z= \frac{-13}{21} -\frac{5}{14} \\\\Z = \frac{-15-26}{42} \\\\Z= \frac{-41}{42}$

Therefore, $\frac{-41}{42}$ is subtracted from the sum of 3/14 and -4/7 to get 13/21

#SPJ2

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