Set-20 Simplification/Approximation For SBI PO and SBI Clerk 2019 | Must Go Through These Questions

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Directions:(1-10) What value will come in place of question mark (?) in the following question?

1. 60 x 71 – 21 x 17 = (?)2 x 2 + 375

2. ∛512 + ∛6859 + ∛3375 = ?

3. (142 x 23 + 33 x 18 + ?)½ = 79

4. (0.09)99 ÷ 0.02756 x 0.0923 x 0.316 = (0.3)?

5. 83.33% of 30 + 33.33% of 51 + 66.66% of 21 = ?

6. 85% of √9216 + 30% of 372 = ? + 155

7. 23 X 85 – 55 x √841 = ?

8. 55% of 46 ÷ 0.01 = ? x 20

9. 67% of 300 + 33% of 800 – 18% of 1100 = ?

10. 30.3 x 243 x 271.3 x 90.2=27?

 

Check your Answers below:

 

 

  • Directions:(1-10) What value will come in place of question mark (?) in the following question?

    1. Question

    60 x 71 – 21 x 17 = (?)2 x 2 + 375

    Ans: 3
    (?)2 x 2 = 60 x 71 – 21 x 17 – 375(?)2 x 2 = 4260 – 357 – 375 = 3528(?)2 = 1764

    ? = 42

    2. Question

    ∛512 + ∛6859 + ∛3375 = ?

    Ans: 4
    83 = 512, 193 = 6859, 153 = 3375? = ∛512 + ∛6859 + ∛3375= 8 + 19 + 15 = 42

    3. Question

    (142 x 23 + 33 x 18 + ?)½ = 79

    Ans: 5
    Squaring both sides:142 x 23 + 33 x 18 + ? = 792 = 6241? = 6241 – 142 x 23 – 33 x 18
    ? = 6241 – 4508 – 486 = 1247

    4. Question

    (0.09)99 ÷ 0.02756 x 0.0923 x 0.316 = (0.3)?

    Ans: 5
    (0.32)99 ÷ (0.33)56 x (0.32)23 x (0.31)16 = (0.31)?(0.3)(2×99 – 3×56 + 2×23 + 1×16) = (0.31)?So, ? = (2×99 – 3×56 + 2×23 + 1×16)/1 = 92

    5. Question

    83.33% of 30 + 33.33% of 51 + 66.66% of 21 = ?

    Ans: 4
    We note that 83.33% = 5/6, 33.33% = 1/3, 66.66% = 2/3
    So, ? = 30 x (5/6) + 51 x (1/3) + 21 x (2/3)
    = (6 x 5) x (5/6) + (3 x 17) x (1/3) + (3 x 7) x (2/3)
    = (5 x 5) + (1 x 17) + (2 x 7) = 56
    6. Question

    85% of √9216 + 30% of 372 = ? + 155

    Ans: 5
    (85 x 96 + 30 + 1369)/100 = ? + 155? = 49230/100 – 155 = 337.3
    7. Question

    23 X 85 – 55 x √841 = ?

    Ans: 3
    23 x 85 – 55 x 29 = ?=> ? = 1955 – 1595 = 360
    8. Question

    55% of 46 ÷ 0.01 = ? x 20

    Ans: 1
    ? x 20 = 55% of 4600 = 2530=> ? = 2530/20 = 126.5
    9. Question

    67% of 300 + 33% of 800 – 18% of 1100 = ?

    Ans: 3
    ? = 67×3 + 33×8 – 18×11= 201 + 264 – 198 = 267
    10. Question

    30.3 x 243 x 271.3 x 90.2=27?

      Ans: 2
    30.3 x 243 x 271.3 x 90.2=27?30.3 x 35 x 3(3 x 1.3) x 3(2 x 0.2)=3(3 x ?)
    3(0.3+5+3.9+0.4)=3(3 x ?)
    39.6= 3(3 x ?)Equating the powers on both sides
    9.6 = 3 x ?
    ? = 3.2

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