Question

if 4/5 = 12/?, then ? =​

Answer 1

Answer:

uniform rod of length 60 cm and mass 6kg is acted upon by two forces as shown in the diagram

The force exerted by 45 cm part of the rod on 15 cm part of the rod is

1) 9 N

2) 18 N

3) 27 N

4)30 Nuniform rod of length 60 cm and mass 6kg is acted upon by two forces as shown in the diagram

The force exerted by 45 cm part of the rod on 15 cm part of the rod is

1) 9 N

2) 18 N

3) 27 N

4)30 N

Answer 2

Given,

4/5 = 12/?

To find,

The value '?'.

Solution,

This problem can be solved with the concept of ratio and proportion.

Let us assume the value we have to find be 'x'.

The problem  4/5 = 12/x can be interpreted as the ratio of 4:5 on the Left Hand Side being equal to the ratio of 12/x on the Right Hand Side.

Solving further,

$\frac{4}{5}=\frac{12}{x}$

Now,

⇒   4 (x) = 12 (5)

⇒   4x = 60.

⇒   x =15.

Hence, the value of x =15.

Therefore 4/5 = 12/60.  The value of '?' asked in the question is 60.