Question

2. Which one of the following integer satisfies the equation that comes in the box?
- 80 + 30 = __ -20
(A) -30
(B) 30
(C)-20
(D) -70​

Answer 1

Concept: Simple addition and subtraction rule,  

Answer: Option A is the correct answer

Given that: -80+30=___-20

Solution:- let "${X}$" we have to find the value

  then,   we can write,

                    →   -80+30=${X}$-20,

Now,  → -80+30=${X}$-20,

           →      -50=${X}$-20,

           →      ${X}$-20= -50,

           →      ${X}$= -50+20,

           →      ${X}$= -30,

Hence, the correct answer of the question is option "A"

#SPJ3

Answer 2

Concept: This question is from the 'Number System' topic. Here we asked about the integers. Integers are like whole numbers but they can have negative numbers also.

For example: ........-5,-4,-3,-2,-1,0,1,2,3,4,5,........ are integers.

Given: - 80 + 30 = __ -20

To find: Which number satisfies the equation.

Solution: Let the number be 'X', now

$-80+30= X+(-20)$

       $-50=X-20$

          $X= -50+20$

          $X= -30$

Hence the right answer to this question is -30