At a certain school, 2/3 of the population are females. One-tenth of the males are foreign students. If the school has 300 students, how many students are non-foreign male students? Give the rationale and then the answer.
Let's think step by step. There are 300 x 2 / 3 = 200 females in the school. So, 300 - 200 = 100 are males. Out of the 100 males, 100 x 1 / 10 = 10 are male foreign students. Thus, there are 100 - 10 = 90 non - foreign male students.. The answer is: 90.

Dani brings two and half dozen cupcakes for her 2nd-grade class. There are 27 students (including Dani), 1 teacher, and 1 teacher's aid. If 3 students called in sick that day, how many cupcakes are left after Dani gives one to everyone in the class? Give the rationale and then the answer.
Let's think step by step. Dani brings 2.5 x 12 = 30 cupcakes. She needs this many cupcakes to feed everyone in class 27 + 2 = 29. With the 3 students calling in sick, there are this many people in class today 29 - 3 = 26. There are this many cupcakes left after everyone gets one 30 - 26 = 4 cupcakes.. The answer is: 4.

Ryan has 30 stickers. Steven has thrice as many stickers as Ryan. Terry has 20 more stickers than Steven. How many stickers do they have altogether? Give the rationale and then the answer.
Let's think step by step. Steven has 3 x 30 = 90 stickers. And, Terry has 90 + 20 = 110 stickers. Therefore, they have 30 + 90 + 110 = 230 stickers altogether.. The answer is: 230.