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Directions: Study the following questions carefully and choose the right answer:
1
63 × 34 ÷ 93 + ?2 = 72
» Explain it
C
63 × 34 ÷ 93 + ?2 = 72

216 × 81 ÷ 729 + ?2 = 49

216 × 81 ×  1  + ?2 = 49
729

24 + ?2 = 49

?2 = 49 – 24 = 25 = 52

∴  ? = 5

Hence, option C is correct.

2
70% of 1680 + ?% of 1750 = 55% of 2820 – 886
» Explain it
E
70% of 1680 + ?% of 1750 = 55% of 2820 – 886

70  × 1680 +  ?  × 1750 =  55  × 2820 – 886
100 100 100

1176 +  ?  × 175 = 1551 – 886 = 665
10

?  × 175 = 665 – 1176 = –511
10

? =  –511 × 10  = –29.2
175

Hence, option E is correct.

3
326 × 14 – 12 × 88 + (49)2 = ?
» Explain it
B
? = 326 × 14 – 12 × 88 + (49)2

= 4564 – 1056 + 2401  = 5909

Hence, option B is correct.

4
46% of 1250 + ?% of 4680 = 1183.4
» Explain it
E
46% of 1250 + ?% of 4680 = 1183.4

46  × 1250 +  ?  × 4680 = 1183.4
100 100

575 +  ?  × 234 = 1183.4
5

?  × 234 = 1183.4 – 575 = 608.4
5

? =  608.4 × 5  =  3042   = 13
234 234

Hence, option E is correct.

5
» Explain it
C
8 1  + 4 2  = 5 1  + ?
2 7 2

? = 8 1  + 4 2  – 5 1
2 7 2

= (8 + 4 – 5) +  ( 1  +  2  –  1 )
2 7 2

= 7 +  2   = 7 2
7 7

Hence, option C is correct.