RBI Grade B Officers 2016 Sep shift 1 Paper

(3) Additional investment by B
= Rs. 3x
Additional investment by C
= Rs. 5x
Ratio of the equivalent capitals
of A, B and C for 1 month
= 1600 × 12 : 2100 × 8 + (2100+ 3x) 4 : 1500 × 8 + (1500 + 5x)× 4
= 19200 : 16800 + 8400 + 12x :12000 + 6000 + 20x= 19200 : 25200 + 12x : 18000+ 20x
Sum of the terms of ratio
= 19200 + 25200 + 12x + 18000+ 20x
= 62400 + 32x
According to the question,

18000+20x

62400+32x

=

1

3

⇒ 54000+60x=62400+32x
⇒60x–32x=62400–54000
⇒28x=8400
⇒x=

8400

28

=300
⇒ Additional investment by B
= Rs. 3x = Rs. 900