Question

A computer chip $0.32cm$ thick is made up of layers of silicon. If the top and bottom layers are each $0.03cm$ thick and the inner layers are each $0.02cm$ thick, how many inner layers are there?

• A. $13$
• B. $15$
• C. $16$
• D. $52$

Answer 1

The correct option is A $13$

No. of inner layers $=\frac{0.32-(2\times 0.03)}{0.02}$

$=\frac{0.32-0.6}{0.02}$

$=\frac{0.26}{0.02}=13$