Question: In Rodrigo's classroom in the morning there are red chairs, yellow chairs, and blue chairs. There are 4 red chairs. There are 2 times as many yellow chairs as red chairs, and there are 2 fewer blue chairs than yellow chairs. In the afternoon, Lisa borrows 3 chairs. How many chairs are left in Rodrigo's classroom?
Answer with step-by-step thinking: There are 2 * 4 red chairs = 8 yellow chairs. There are 8 yellow chairs - 2 = 6 blue chairs. Total in the morning there were 4 red + 8 yellow + 6 blue = 18 chairs. After Lisa removed chairs there were 18 - 3 chairs = 15 chairs remaining.
So the answer is 15.


Question: Anika has 4 more than twice the number of pencils as Reeta. If Reeta has 20 pencils, how many pencils do the two have together?
Answer with step-by-step thinking: If Reeta has 20 pencils, then twice that number is 2 * 20 = 40 pencils. Anika has 4 more than twice the number of pencils as Reeta, which means she has 40 + 4 = 44 pencils. Together, the two have 44 + 20 = 64 pencils.
So the answer is 64.


Question: There were 18 students assigned in a minibus for a field trip. Eight of these students were boys. On the day of the field trip, the number of girls and boys was the same since some of the girls were not able to join the trip. How many girls were not able to join the field trip?
Answer with step-by-step thinking:
8 boys + 8 girls = 16 students joined the field trip. Thus, 18 - 16 = 2 girls were not able to join the field trip.
So the answer is 2.