Question

16 – 21 ÷ 7 x 6 + 3 = 31
A: – and +
B: + and x
C: ÷ and +
D: ÷ and x
E: – and
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Answer 1

Answer:

a -and + i think so dont think this is right

Answer 2

Changing  - & +  , also   + and x  makes equation true

Step-by-step explanation:

Given 16 – 21 ÷ 7 x 6 + 3 = 31

we need to find which signs we need to change to make equation true

16 – 21 ÷ 7 x 6 + 3 = 31

LHS =  16 - 3 * 6 + 3 = 16 - 18 + 3 = -1 ≠ 31

A: – and +  Changing  - & +

16 + 21  ÷ 7 x 6 - 3 = 31

LHS = 16 + 3 * 6 - 3  

= 16 + 18 - 3

= 34 - 3

= 31

= RHS

Hence Changing  - & + makes equation true

B

+ and x

16 – 21 ÷ 7 + 6  x 3

= 16 - 3 + 18

= 13 + 18

= 31

= RHS

Changing  + and x  also makes equation true

C: ÷ and +

16 – 21 + 7 x 6 ÷ 3

16 - 21 + 14

= 9 ≠ 31

D: ÷ and x

16 – 21 x 7 ÷ 6 + 3

= 16 - 24.5 + 3

= - 5.5  ≠ 31

Learn more:

Change the sign to find equation 48

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