1. car a can go 25 miles/gallon of gasoline, while car b can go 11.9 miles/gallon of gasoline. if both cars are driven 12,000 miles, how many more gallons of gasoline will car b consume than will car a? (rounded to the unit digit)
2. a company increases its costs/labor charges from $50/hour to $60/hour and enhances its parts charges by 8%. a certain job requires 1.5 hours of labor charges and parts charges, and the parts charges before change were $125/hour. what percent will the total charges for this job increase?
3. among the 600 attendees of a conference, 250 are republicans and 100 vegetarians. how many of the republicans are vegetarians?
1) 300 are neither republicans nor vegetarians
2) 200 republicans are not vegetarians
4. the average salary for company a is $3500, and the average salary for company b is $4500. how many people are in company a?
1) the average salary for company a and company b is $4200
2) there are totally 500 employees in a and b.
5. ax+by+c=0. the slope is 1/2. what’s the value of b?
1) a=2;
2) c=4
6. 30!/10! is expressed as the product of integers. the biggest integer is 30. what’s the smallest integer?
7. there are 500 marbles in a jar. 200 are red, 100 are blue, and 200 are green. if two marbles, one at a time without placements, are taken from the jar. what’s the possibility that both marbles are red?
