Direction : What will come in the place of question mark (?) in the following question:
1
85% of 620 + x% of 480 = 70% of 890
» Explain it
B
85% of 620 + x% of 480 = 70% of 890
 
527 + x × 480 ÷ 100 = 623
 
x × 4.8 = 623 – 527
 
x × 4.8 = 96
 
x = 20%

Hence, option B is correct.
2
(624 + 146) × 2 ÷ 77 = ? ÷ (– 2)
» Explain it
E
(624 + 146)  ×  2  =  ?
77 – 2

770  ×  2  =  ?
77 – 2

20 × (– 2) = ? ? = – 40 Hence, option E is correct.
3
(5.25 × 6 × 4) ÷ 7 – 2 = ?2
» Explain it
A
(5.25 × 6 × 4)  – 2 = ?2
7

126  – 2 = ?2
7
18 – 2 = ?2 ?2 = 16 ? = 4 Hence, option A is correct.
 
4
(66 × 23 × 42) ÷ 12 = ? + 123 – 59

» Explain it
E
66 × 23 × 42
 = ? + 123 – 59
12

? + 64 = 
66 × 23 × 42
12

? + 64 =  6 × 6 × 2 × 4
12
? + 64 = 24

? = 24 – 64

? = – 40

Hence, option E is correct.
 
5
[(2401 + 625) – (29 + 5)] ÷ 4 = ?1/2
» Explain it
D
(2401 + 625) – (29 + 5)  = ?1/2
4

(49 + 25) – ( 34)  = ?1/2
4

74 – 34  = ?1/2
4

40  = ?1/2
4
10 = ?1/2

? = 100

Hence, option D is correct.