What will come in place of Question mark (?) in the following question:
1
468 ÷ 39 × 20 + 226 = ? + 420
» Explain it
B
468 ÷ 39 × 20 + 226 = ? + 420
 
? = 468 ÷ 39 × 20 + 226 – 420
 
= 12 × 20 + 226 – 420
 
= 240 + 226 – 420
 
? = 46

Hence, option B is correct.
 
2
( 2 288 – 31 ) + ( 8  –  6 ) 2  = (?)2

» Explain it
E
( 2 288  – 31 )  +  ( 8  –  6 ) 2  = (?)2

or,  (?)2 = 2 36 × 8  – 31 + 8 + 36 – 12 8

or, (?)2 = 12 8  – 31 + 8 + 36 – 12 8

? = 13

Hence, option E is correct.
 
3
2 1  + 5 1  – 4 1  = ? + 1 1
4 6 8 12
» Explain it
B
2 1  + 5 1  – 4 1  = ? + 1 1
4 6 8 12

? = (2 + 5 – 4 – 1) +  ( 1  +  1  –  1  –  1 )
4 6 8 12

= 2 +  ( 6 + 4 – 3 – 2 )  = 2 +  5  = 2 5
24 24 24

Hence, option B is correct.

4
42% of 580 +  3  of 2030 – 37% of 670 = ?
7

» Explain it
B
42% of 580 +  3  of 2030 – 37% of 670 = ?
7

? = 243.6 + 870 – 247.9

? = 865.7

Hence, option B is correct.
 
5
6668 + 446.8 + 2468.28 – 8326.68 + 2248.6 = ?
» Explain it
C
6668 + 446.8 + 2468.28 – 8326.68 + 2248.6 = ?
 
? = 6668 + 446.8 + 2468.28 – 8326.68 + 2248.6
 
? = 3505 

Hence, option C is correect.