Tricks to Solve Simplification - Addition and Subtraction

# Series/Addition/Subtraction

Series of Addition of 4
Q1 Find 8 + 888 + 8888 + 88888 ?


a) 97760 b) 98572 c) 98672 d) 97672 e) None of the above

Q2. Find 9.4 + 99.44 + 999.444 + 9999.4444 ?

a) 11207.728 b) 11107.728 c) 11106.728 d) 11111.728 e) None of these

Equation with Algebra Formulas

Other Algebra Formulas
Q3. ( 2.3 + 3.3 ) [ ( 2.3)2 - 2.3✘3.3 + (3.3)2 ] = ?

a) 48.104 b) 47.104 c) 47.204 d) 48.204 e) None of these

Q4. (3-2) [(3)4+((3)3✘2)+(3)2✘(2)2+(3✘23)+24] = ?

a) 311 b) 211 c) 201 c) 221 d) 301 e) None of these

Q5. (125.824+124.654)2 + (125.824-124.54)2 / ((125.824)2+(124.54)2)

a) 1.166 b) 1 b) 2 c) 625 d) 250.478 e) None of these




Fraction

Q6. Evaluate 1 +  1/1*3 + 1/1*3*9 + 1/1*3*9*271/1*3*9*27*81 up to three places of decimals ? 

a)1.367 b) 1.370 c) 1.361 d) 1.267 e) None of these

Q7. 2 ÷ [2+ 2÷{2+2 ÷ 4)}]= x / 19. Find x.

a) 3 b) 4 c) 5 d) 6 e) None of these
a) 0.67 b) 0.77 c) 0.87 d) 0.97 e) None of these

Q9) Find the sum of all even natural numbers less than 75.

a) 1416 b) 1426 c) 1396 d) 1406 e) None of these




Solution:

(1)
Sol : Option (c)
8*(12345) - 88 = 98672

(2)
Sol: Option (b)
9(1234) = 11106
 4(4321) = 17284
=1.7284
=11106+1.7284=11107.7284

(3)

Sol: Option (a)
(a3 + b3)=(a+b) (a2-ab+b2)
a = 2.3, b = 3.3;
(a)3 = 12.167, (b)3 = 35.937 (a3+b3)=48.104

(4)
Sol: option (b)
(a5-b5)=(a-b) [a4+a3b+a2b2+ab3+b4] = ?
a = 3, b = 2; (3)5=243, (2)5 =32;
(a5-b5) = 243-32= 211

(5)
Sol: Option (b)
(a+b)2 + (a-b)2=2((a)2+(b)2) Hence Answer is 2

(6)
Sol: Option (a)
1+0.33+0.0370 ... hence (a) is the answer no further addition is required.

(7)
Sol: option (e)
Using VODMAS method
Step 1. [ 2+ 2/4 ] = 5/2.
Step 2. ( 2 + 2 ÷5/2) = 2÷ 2✘2/5 =14/5
Step 3. [2+2÷14/5]=2+2*5/14=19/7
Step 4. L.H.S = 2÷19/7=14/19 = x/19 Hence x=19

(8)

Sol: Option (c)
= -4 + 0.45 + 2 + <sup>927-9</sup>/<sub>990</sub> +6/9
= -4 + 0.45 + 2 + <sup>918</sup>/990 +3/2
= (- 4 + 2) + (0.45+1.5) + (<sup>51</sup>/55)
= -2 + 1.95 + 0.92  = 0.87

(9)
Sol: Option (d)
sum= 2 + 4 + 6 + ...+74 a=2 , d=(4-2)=2,l=74 n=37; sum= n/2 (a+l) 37/2✘(2+74)=(37✘38) =37✘(40-2) =(37✘40)-(37✘2) =(1480-74)=1406

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39 comments:

  1. Jaspreet Singh DhaliwalJune 23, 2015 at 3:01 PM

    SIR this is showing me invalid login

    ReplyDelete
  2. sir in question no 3, i think you have calculated wrongly.cube of 2.7 is 19.683, and above sums also solved wrongly pls check and update.

    ReplyDelete
  3. Sir pls provide rbi assistant 2014 paper in pdf

    ReplyDelete
  4. Saikam Rama Krishna ReddyJune 23, 2015 at 4:00 PM

    please explain second problem...

    ReplyDelete
  5. Very nice share thnxx a lot

    ReplyDelete
  6. pre exam training for for idbi executive post

    ReplyDelete
  7. < thanks >

    ReplyDelete
  8. Is it for Manipal School Course !!

    ReplyDelete
  9. Sir, please explain problem no. 6?

    ReplyDelete
  10. Anshul SrivastavJune 23, 2015 at 9:26 PM

    In question 1 why am getting 10760 instead of 98762 using same method

    ReplyDelete
  11. Anshul SrivastavJune 23, 2015 at 9:37 PM

    Y m getting 10760 instead of 98672 in question 1 using same method as given in frst example

    ReplyDelete
  12. Please Explain this trick

    ReplyDelete
  13. 1/(1*2)+1/(2*3)+1/(3*4)+1(5*6)+1/(6*7)+1/(7*8)
    SO 1/1(1-1/8) =7/8 (1/8) is last numbe

    ReplyDelete
  14. 1/(1*2)+1/(2*3)+1/(3*4)+1(5*6)+1/(6*7)+1/(7*8)
    difference (2-1=1, 3-2=1 ,4-3=1 and so on.. and last number is 1/8
    SO 1/1(1-1/8) =7/8

    ReplyDelete
  15. At what ratio must water be added to milk to gain 25% by selling it at cost price? Plzz explain it.

    ReplyDelete
  16. At what ratio must water be added to milk to gain 25% by selling it at cost price? Plzz explain it.

    ReplyDelete
  17. invalid login showing..:( i applied for executive post

    ReplyDelete
  18. Q2 ) Ans None of these crct ans i guess 11009.8889????

    ReplyDelete
  19. Q2. Find 9.4 + 99.44 + 999.444 + 9999.4444 ? can u explain this Q??? with A???

    ReplyDelete
  20. Sir,In que 1.,why u subtract 88,while in example u didn't......and in same que 88 is not given by u so why u count it as 2 and multiply with 8...

    ReplyDelete
  21. How to solve this:
    4+44+444+44444=?

    ReplyDelete
  22. Mayuri ChawrekarJune 25, 2015 at 2:00 PM

    can any 1 xplain me the trick of this ques:

    ReplyDelete
  23. Mayuri ChawrekarJune 25, 2015 at 2:15 PM

    4(12345)-4444=44936
    44936 is the ans.

    ReplyDelete
  24. Mayuri ChawrekarJune 25, 2015 at 2:33 PM

    in the sol of que no 8, 0.6 bar is written as 3/2, while it should be 2/3, due to which the ans is wrong... plz update...

    ReplyDelete
  25. Examples are simple .So it can help you in questions.
    Now second question is just like this:
    2+22+2222
    2*1234=2468
    2468-222=2246

    ReplyDelete
  26. Mayuri ChawrekarJune 25, 2015 at 7:31 PM

    I'm getting my ans as around 0.5... I checked ur sol in which I found that 6/9 is written as 3/2 while it should be 2/3.... due to which ur ans is 0.87... which I find is wrong..

    ReplyDelete
  27. Mayuri ChawrekarJune 26, 2015 at 3:04 PM

    oh:), u r welcome, mini:).

    ReplyDelete
  28. Sir ji kindly explain 1+1/1*3+1/1*3*9+1/1*3*9*27+1/1*3*9*27*81

    ReplyDelete

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