- Seventeen hundredths less than a number \( n \) is equal to four tenths.

To solve this equation, you can set it up as \( n - 0.17 = 0.4 \). Adding 0.17 to both sides helps isolate \( n \), yielding \( n = 0.4 + 0.17 \). Voila! Now, with a little addition, you'll find that \( n = 0.57 \), which is your cheerful answer. If you're ever in a pinch with similar equations, remember to keep an eye on the signs and perform the inverse operations diligently. A common mistake is forgetting to add or subtract correctly, which can lead to a slippery slope of incorrect answers. Double-check your math to keep things squeaky clean!