Question: Roman the Tavernmaster has $20 worth of gold coins. He sells 3 gold coins to Dorothy. After she pays him, he has $12. How many gold coins does Roman have left?
Answer with step-by-step thinking: Dorothy paid $12 for 3 gold coins so each gold coin is worth $12 / 3 = $4. The Tavern master originally had $20 worth of gold coins which is $20 / $4 = 5 gold coins. He gave 3 out of 5 gold coins to Dorothy so he now has 5 - 3 = 2 gold coins left.
So the answer is 2.


Question: When Spencer jumps rope, he jumps 4 times per minute. He jumps for 10 minutes each session and does 2 sessions each day. How many jumps will Spencer do in 5 days?
Answer with step-by-step thinking: In 1 session he jumps 4 times / minute * 10 minutes = 40 times. In 5 days he does 2 sessions / day * 5 days = 10 sessions. He jumps 10 sessions * 40 times / session = 400 times in 5 days.
So the answer is 400.


Question: Dream's car consumes 4 gallons of gas per mile. If she drives 400 miles today and 200 more miles tomorrow than today, how many gallons of gas will the car consume?
Answer with step-by-step thinking:
If she drives 400 miles today, the car will have consumed 4 * 400 = 1600 gallons of gas. Tomorrow, if she drives 200 more miles, the total distance will be 200 + 400 = 600 miles. The fuel consumption by the car tomorrow is 4 * 600 = 2400 gallons. The car's total fuel consumption in the two days is 2400 + 1600 = 4000 gallons.
So the answer is 4000.