Q: Mike is building a bridge out of LEGO blocks. To be successful he needs at least 40 bricks of type A, and half that many of type B. In total, he needs to use 150 bricks. How many bricks of other types than mentioned is he going to use?
A: 90
Step-by-step reasoning process: Mike is using 40 blocks / 2 = 20 blocks of type B. He uses in total 40 blocks + 20 blocks = 60 blocks of type A and B. So he is going to use 150 blocks - 60 blocks = 90 blocks of other types.


Q: It takes 3 men an hour to complete a job. If they are hired to work on 5 such similar jobs by a company that pays each of them $10 per hour, calculate the total amount of money the three will earn when they complete the jobs?
A: 150
Step-by-step reasoning process: Since they are paid $10 each per hour of work and can complete a job in one hour, they earn a total of $10 * 3 = $30 together for an hour of work. If they earn together $30 for one job, for the five jobs, they'll earn $30 * 5 = $150.


Q: In the engineering department, 70% of the students are men and 180 are women. How many men are there?
A: 420
Step-by-step reasoning process: 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.


Q: A hay farmer harvested 560 bales of hay from 5 acres of grass per month last year. This year, he planted an additional 7 acres of grass. If the farmer also owns 9 horses and each horse consumes 3 bales of hay a day, how many bales of hay would the farmer have left by the end of December if he starts feeding them this year's hay beginning the first day of September?
A: 12834
Step-by-step reasoning process: For every acre of grass, the farmer can harvest 560 / 5 = 112 bales of hay each month. This year, the farmer has 7 + 5 = 12 acres of grass. He can expect to harvest 12 x 112 = 1344 bales of hay per month. The total hay production this year is 1344 * 12 = 16128. From September to December, the farmer would have to feed his horses for a total of 30 + 31 + 30 + 31 = 122 days. Each day his horse eats a total of 3 * 9 = 27 bales of hay. For the 122 days, the horses will eat a total of 27 * 122 = 3294 bales. The total number of bales remaining will be 16128 - 3294 = 12834.