Question

Piya glued $4$ white cubes together as shown. Then she painted the entire object red.
How many faces of the $4$ cubes were painted red?

• A. $4$
• B. $9$
• C. $18$
• D. $24$

Answer 1

Answer: (C)

$18$

We need to count the number of the faces outside, they will be the ones colored red.

There are $4$ faces each on the front, back, upper and down sides.

And $1$ faces each on side faces.

So there are in total $4\times 4+2$, i.e. $18$ faces coloured red.