RRB Group-D Model Paper 19 with answers for online practice

Question : 13 of 100

Marks: +1, -0

When 16 is subtracted from 3 times a number. The result is 8. What is the cube of the original number?

Solution:

Concept:/Formula:
If x is subtracted from n times of y, then = ny - x
Calculation:
Let the number be x, then
According to the question
⇒ 3x – 16 = 8
⇒ 3x = 8 + 16
⇒ 3x = 24
⇒ x = 24/3
⇒ x = 8
∴ The original number is 8.
Cube of the original number is =

8^3

= 512.

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