**PUZZLE 15**

A two-digit number, read from left to right, is 4.5 times as large as the same number read from right to left. What is the number?

**PUZZLE 16**

Some ducks are marching across a path. There's a duck in front of two ducks, there's a duck behind two ducks, and there's a duck in the middle of two ducks.

What's the least number of ducks that there could have been?

**SOLUTIONS**

**PUZZLE 15 : 18 and 81**

**PUZZLE 16 : 3 Ducks.**

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