Joan has 180 socks. Two thirds of the socks are white, and the rest of the socks are blue. How many blue socks does Joan have? Give the rationale and then the answer.
Let's think step by step. Joan has (180 / 3) * 2 = 120 white socks. The number of blue socks Joan has is 180 - 120 = 60.. The answer is: 60.

A liter of chlorine costs $10 and is now sold at 20% off. A box of soap that costs $16 is now sold at 25% off. How much will you save if you buy 3 liters of chlorine and 5 boxes of soap? Give the rationale and then the answer.
Let's think step by step. For each liter of chlorine, I can save $10 x .20 = $2. For each box of soap, I can save $16 x .25 = $4. With the 3 liters of chlorine, I can save $2 x 3 = $6. With the 5 boxes of soap, I can save $4 x 5 = $20. Therefore, I can save a total of $6 + $20 = $26.. The answer is: 26.

In the engineering department, 70% of the students are men and 180 are women. How many men are there? Give the rationale and then the answer.
Let's think step by step. The percentage for women is 100% - 70% = 30%. Since 180 represents 30%, then 180 / 30 = 6 students represent 1%. Hence, 6 x 70 = 420 students are men.. The answer is: 420.