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Directions: Study the following questions carefully and choose the right answer:
Important for :
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
 8 1 + 4 2 = 5 1 + ? 2 7 2

» 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.