In a triad of ‘A’, ‘B’, ‘C’ elements is the atomic mass of ‘B’ and ‘C’ are 150 and 200 respectively. One atomic mass of ‘A’ is

# In a triad of 'A', 'B', 'C' elements is the atomic mass of 'B' and 'C' are 150 and 200 respectively. One atomic mass of 'A' is

1. A
100
2. B
125
3. C
250
4. D
350

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### Solution:

A - ?

B – 150

C – 200

Arithmetic Mean $\frac{\text{A+C}}{2}=\text{B}$

$\frac{\text{A+200}}{2}=150$

$\text{A}+200=300$

$\text{A=300-200}$

$\text{A=100}$

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