Question

71+2=68, 33-4=20 , 84÷3=?

Answer 1

We have:

71 + 2 =  68, 33 - 4 = 20

We have to find the value of 84 ÷ 3 = ?

Solution:

71 + 2 = $(7+1)^{2} +2^{2}$

          = $8^{2} +4$

          = 64 + 4

          = 68

33 - 4  = $(3+3)^{2} -4^{2}$

          =  $6^{2} -16$

          = 36 - 16

          = 20

Similarly,

84 ÷ 3 = $(8+4)^{2}$ ÷ $3^{2}$

⇒ ?     = $12^{2}$ ÷ 9

⇒ ?      = 144 ÷ 9

⇒ ?      = 16

Thus, the value of missing number (?) is "equal to 16".

Answer 2

Given:

71+2=68, 33-4=20

To find:

84÷3=?

Solution:

From given, we have the data as follows.

71 + 2 = 68, 33 - 4 = 20, 84 ÷ 3 = ?

We will solve one by one.

71 + 2 = 68

= (7 + 1)² + 2²

= 8² + 2²

= 64 + 4

= 68

33 - 4 = 20

= (3 + 3)² - 4²

= 6² - 4²

= 36 - 16

= 20

84 ÷ 3 = ?

= (8 + 4)² ÷ 3²

= 12² ÷ 3²

= 144 ÷ 9

= 16

Therefore, the value of the 84 ÷ 3 is 16