Two glass bulbs A and B are connected by...

Two glass bulbs A and B are connected by a very small tube having a stop cock. Bulb A has a volume of 100 `cm^(3)` and contained the gas, while bulb B was empty. On opening th stop cock. The pressure fell down to 40%. The volume of the bulb B must be:

`75 cm^3`

`125 cm^3`

`150 cm^3`

`250 cm^3`

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