RRB Group-D Model Paper 12 with answers for online practice

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Question : 64 of 100

Marks: +1, -0

If

a^2b, bc, x and c^2

are in continued proportion, then find x, if none of these is equal to zero.

ac
$a^2b^2$
$a^2 c$
$c^2 a$

Solution:

Now as

a^2b, bc, x and c^2

are in proportion
We can write

a^2b: bc = x : c^2

∴ a^2 : c = x : c^2

∴

a^2

= x : c
∴ x =

a^2c

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