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Bangladesh Krishi Bank Cash Written Questions And Math Solution:
Post: Cash Officer
Written Exam date: 13 January 2018
Math Solution:
a.7,10,13
b.15
c.50
d.a=16, B=27
e.100 & 500
f.220
g.500;480
h.(a+1/a) (a+1/a-2).
Detail Solution:
6. a)
Let the Three numbers: a,a+x,a+2x
Atq, 3a+3x=30
A+X=10
X=10-A
And,
A.A+10.10+(20-A)(20-A)=318
500+2A.A-40A-318=0
A.A -20A+91=0
A=7,13
A=7
7,10,13and
A=13
13,10,7,ans
6.b)
Atq, 50=35+b-25
b=40
only speck bangla 40-25=15
6. c)
Area of triangle= 1/2 (10*10)= 50 Ans.
6. d) 64x^3 -9ax^2 + 108x -b
=(4x)^3- 3 (4x)^2 (3) + 3 (4x) (3)^2-(3)^3
=(4x-3)^3
so, a= 16 and b= 27
6. h)
a^2 + 1/a^2 +2 -2a – 2/a
=a^2 + 1/a^2 +2*a*1/a -2a -2/a
= (a+1/a)^2 -2a -2/a
= (a+1/a)^2 -2(a+1/a)
= (a+1/a) (a+1/a -2)
See The question in image below:
Bangladesh Krishi Bank Cash Written Questions And Math Solution: