Answer this question:Jane is looking at a tree. At the same time, the tree and Jane are casting shadows - the tree of 10 meters and Jane of 0.5 meters. Jane is 1.5 meters tall. How tall is the tree?
The shadow of Jane is 1.5 / 0.5 = 3 times smaller than her height. The height of the tree is therefore 3 times bigger than the shadow, so it's 3 * 10 = 30 meters tall.
The answer is 30.

Answer this question:Adam, Andrew and Ahmed all raise goats. Adam has 7 goats. Andrew has 5 more than twice as many goats as Adam. Ahmed has 6 fewer goats than Andrew. How many goats does Ahmed have?
Andrew: 5 + 2(7) = 19 goats. Ahmed:19 - 6 = 13 goats.
The answer is 13.

Answer this question:Jimmy has 18 cards. Jimmy gives three cards to Bob. If Jimmy gives Mary twice as many cards as he gave to Bob, how many cards does Jimmy have left?
Mary has 2 * 3 = 6 cards. Jimmy has 18 - 3 - 6 = 9 cards left.
The answer is 9.

Answer this question:Yulia was able to net $44 in profit this week. Her lemonade stand made a gross revenue of $47 this week. She was also able to babysit and made $31. However, her lemonade stand is expensive to run because she needs to buy lemons, sugar, and sunscreen. How much did she spend to operate her lemonade stand, in dollars?
Yulia's total gross revenue was $47 + $31 = $78. To calculate her overhead we must subtract her total profit from her gross revenue which is $78 - $44 = $34.
The answer is 34.