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1.  
48 × ? ÷ 16 = 135 − 27. Find ?

Correct Answer: A [36]

Explanation:

48 ÷ 16 = 3, so 3 × ? = 108 → ?

2.  
3/4 of ? − 25% of 480 = 210. Find ?

Correct Answer: D [440]

Explanation:

3/4 of ? = 210 + 120 = 330 → ?

3.  
?% of 801.03 + 24.98² ≈ 785. Find ? (approximately)

Correct Answer: B [20]

Explanation:

≈ ?% of 800 + 625 = 785 → ?% of 800 = 160 → ?

4.  
1,728 ÷ ? × 6 = 2,592 ÷ 12. Find ?

Correct Answer: E [48]

Explanation:

Right side = 216; 1,728 × 6 ÷ ?

5.  
17.98 × ? + 12.03² ≈ 504. Find ? (approximately)

Correct Answer: C [20]

Explanation:

≈ 18 × ? + 144 = 504 → 18 × ?

6.  
√? × 14 = 25% of 2,240 − 140. Find ?

Correct Answer: A [900]

Explanation:

Right side = 560 − 140 = 420; √?

7.  
2⁵ × ? ÷ 2³ = 4⁴. Find ?

Correct Answer: D [64]

Explanation:

2⁵ ÷ 2³ = 4, so 4 × ? = 256 → ?

8.  
(? + 15)² = 1,089. The positive value of ? is:

Correct Answer: B [18]

Explanation:

√1,089 = 33 → ? + 15 = 33 → ?

9.  
6 2/3 + ? − 3 1/4 = 8 1/2. Find ?

Correct Answer: A [5 1/12]

Explanation:

? = 8 1/2 + 3 1/4 − 6 2/3 = (102 + 39 − 80)/12 = 61/12 = 5 1/12.

10.  
39.97% of 1,250 + ? × 4.98 ≈ 650. Find ? (approximately)

Correct Answer: E [30]

Explanation:

≈ 40% of 1,250 + 5 × ? = 650 → 500 + 5 × ?

11.  
444 ÷ 12 × ? = 37² − 37 × 13. Find ?

Correct Answer: D [24]

Explanation:

444 ÷ 12 = 37 and the right side is 37 × (37 − 13) = 37 × 24 → ?

12.  
? ÷ 0.25 + 0.5 × 64 = 112. Find ?

Correct Answer: C [20]

Explanation:

? ÷ 0.25 = 4 × ?; 4 × ? + 32 = 112 → 4 × ?

13.  
∛2,197 × ? − 51 = 14². Find ?

Correct Answer: E [19]

Explanation:

∛2,197 = 13; 13 × ? = 196 + 51 = 247 → ?

14.  
1,199.98 ÷ ? + 7.01 × 8.99 ≈ 143. Find ? (approximately)

Correct Answer: A [15]

Explanation:

≈ 1,200 ÷ ? + 63 = 143 → 1,200 ÷ ?

15.  
5/9 of 6/7 of ? = 120. Find ?

Correct Answer: C [252]

Explanation:

5/9 × 6/7 = 10/21; ? = 120 × 21/10 = 252.

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