Question

What number should be subtracted from the product (2/7 and 3/8) to get -3/7.

Answer 1

solution,

let the number be x,

(x-1/2)1/2=1/8

so we need to solve this,

2x-1/2 * 1/2 = 1/8

2x-1/2=1/8*2/1=1/4

2x-1/2=1/4

so, 2x=1/4+1/2=6/8=3/4

hence, 2x=3/4,

so, x=3/8

Answer 2

Answer:

⇒10−x=

4

17

⇒10−

4

17

=x

⇒x=

4

40−17

=

4

23

⇒x=5

4

3

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