Question

Ramya wanted to arrange 90 barfi(with $1\times 1$ dimension) in a box. She has 5 boxes of dimension $10\times 9$, $9\times 10$, $5\times 18$, $16\times 5$ and $18\times 5$. Which box cannot be used to arrange all the barfis?

• A. 10 X 9
• B. 16 X 5
• C. 18 X 5
• D. 5 X18

Answer 1

The correct option is B

16 X 5

The dimension of one barfi is $1\times 1=1$ units and she has to arrange 90 barfis in the box.

Minimum space needed by Ramya to arrange all the Barfis.

Except for $16\times 5$, the size of all the boxes is 90 units.

$16\times 5=80$ so she cannot arrange all the barfis in this box