What is the approximate value should come in place of question mark in the following questions?

1) 8.99² -? = 5.01² + 3.009²

A.27

B.37

C.47

D.57

E.50

2) (43.98+16.01) ÷ 2.03 × 4.99 = ?² + 50.03

A.20

B.10

C.25

D.30

E.15

3) ³√(27.003) of 9.98² ÷ 5.99 = 8.003²- ?

A.20

B.10

C.14

D.18

E.none of these

4) (2 ÷ 3.98) of 29.978 +? ÷ 4.99 = 30.01 – 3.02²

A.24

B.35

C.20

D.30

E.none of these

5) 2.003 + 5.006 – 12.9998 + 30.979 – 10.005 = ?

A.10

B.09

C.11

D.12

E.15

Answers :

1) Answer: C

8.99² - x = 5.01² + 3.009²

9² – x = 5² + 3²

81 – x = 25 + 9

x = 47

2) Answer: B

(43.98+16.01) ÷ 2.03 × 4.99 = x² + 50.03

(44+16) ÷ 2 × 5 = x² + 50

x² +50 = 60 ÷ 2×5

x² + 50 = 30×5

x² = 150-50

x = 10

3) Answer: C

³√(27.003) of 9.98² ÷ 5.99 = 8.003² - x

3 of 100 ÷ 6 = 64 –x

x= 64-50

x = 14

4) Answer: D

(2 ÷ 3.98) of 29.978 +? ÷ 4.99 = 30.01 – 3.02²

(2÷4) of 30 + x ÷ 5 = 30 - 3²

1/2 of 30 + x ÷ 5 = 30 – 9

15 + x ÷ 5 = 21

x ÷5 = 6

x = 6×5 =30

5) Answer: E

2.003 + 5.006 – 12.9998 + 30.979 – 10.005 = x

x = 2 + 5 – 13 +31 – 10

x = 38 – 23

x = 15