The area of square A is 25. The area of square B is 81. What's the length difference between the sides of square A and B? Give the rationale and then the answer.
Let's think step by step. The area of a square is calculated as length * width. Because all a square has all sides equal then we can say that given a side S, the area is S * S. For square A of sides A, the area is A * A = 25 or A^2 = 25. Solving for A we know that A = 5. For square B of sides B, the area is B * B = 81 or B^2 = 81. Solving for B we know that B = 9. The side difference between A and B is 9 - 5 = 4.. The answer is: 4.

Walter works 5 days a week in a fast-food chain and earns $5 per hour. Since he is a working student, he can only work 4 hours a day and allocates 3/4 of his weekly earning for his schooling. How much does he allocate for school? Give the rationale and then the answer.
Let's think step by step. Walter's daily earning is $5 x 4 = $20. So he earns $20 x 5 = $100 per week. Therefore, he allocates $100 x 3 / 4 = $75 for his school.. The answer is: 75.

198 passengers fit into 9 buses. How many passengers fit in 5 buses? Give the rationale and then the answer.
Let's think step by step. 198 passengers / 9 buses = 22 passengers fit in one bus. 22 passengers / bus * 5 buses = 110 passengers fit in 5 buses.. The answer is: 110.