Direction: What approximate value should come in the place of question mark (?) in the following questions?
1
» Explain it
C
? = 3739 + 164 × 27
 
= 3739 + 4428 ≈ 8200

Hence, option C is correct.
 
2
(8.97)2 × (15.05)2 ÷ 
624.89
 = 9?
» Explain it
A
(8.97)2 × (15.05)2 ÷
624.89
= 9?

⇒  9?  ≈  (9)2 × (15)2 ÷ 
625
 

⇒  9? ≈ 81 × 225 ÷ 
252
 

⇒  9? ≈  81 × 225  
25

⇒  9?  ≈  93

∴   ?  =  3

Hence, option A is correct.

3
18.23 × 23.04 ÷ ? + 252 = 329.07
» Explain it
D
18.23 × 23.04 ÷ ? + 252 = 329.07

≈   18 × 23  + 252 = 329  
?

≈  or,  18 × 23  = 77  
?

≈  or,  18 × 23  = ?  ⇒  ? = 5.33 ≈ 5
77

Hence, option D is correct.

4
124% of 624.809 + 11.75% of 1279.43 = ?
» Explain it
A
124% of 624.809 + 11.75% of 1279.43 = ?
 
? ≈ 125% of 625 + 12% of 1280
 
? ≈ (100% of 625 + 20% of 625 + 4% of 625) + (10% of 1280 + 2% of 1280)
 
? ≈ (625 + 125 + 25) + (128 + 25.6) 
 
? ≈ 775 + 153.6 = 928.6 ≈ 925.

Hence, option A is correct.
 
5
?2 + 34.68% of 1495.89 + 279 = 3420.679
» Explain it
B
?2 + 34.68% of 1495.89 + 279 = 3420.679

⇒ ?2 ≈ 3421 – (35% of 1496 + 279)

⇒ ?2 ≈ 3421 – (30% of 1496 + 5% of 1496 + 279)

⇒ ?2 ≈ 3421 – (448.8 + 74.8 + 279)

⇒ ?2 ≈ 3421 – (802.6)

⇒ ?2 ≈ 2618 ⇒ ?2 ≈ (52)2

⇒ ? = 52

Hence, option B is correct.


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