A
2:r=12:18
r=?
r=3
50:20=5:h
h=?
h=2
16:6=3D:9
D=?
D=8
45:27=x:3
X=?
X=5
The ratio of boys to girls is 3 to 2. If there are 12 boys, how many girls are there?
男生和女生的比是 3 :2，如果有 12 个男生，那么有多少个女生？
8 girls
It takes one Super Bigt Pizza to feed 3 people. If you invite 36 people, how many pizzas will you need?
一个超级巨无霸披萨可以供 3 个人食用。如果你邀请了 36 人，你需要多少个披萨？
12 pizzas
At a recent party, it cost $9.50 for refreshments for 10 guests. At this rate, how much would it cost to have refreshments for 80 guests?
在最近的一次聚会上，10 位客人的茶点花费了 9.50 美元。按照这个价格，为 80 位客人提供茶点需要多少钱？
76
Mary has saved $17.50 in the past 3 weeks. At this rate, how much will she save in 15 weeks?
玛丽在过去的 3 周里存下了 17.50 美元。按照这个速度，她在 15 周内能存多少钱？
$87.5
Mr. Johnson was paid $190 for a job that required 40 hours of work. At this rate, how much should he be paid for a job requiring 60 hours of work?
约翰逊先生需要工作 40 小时，他的工资是 190 美元。按照这个标准，他应该为需要工作 60 小时的工作支付多少报酬？
$285
The park ranger stocks the children’s fishing pond keeping a ratio of 4 sunfish to 3 perch. If he puts 300 sunfish into the pond, how many perch should be put into the pond?
公园管理员在儿童垂钓池塘里放养了 4 条太阳鱼和 3 条鲈鱼。如果他在池塘里放了 300 条太阳鱼，那么应该放多少条鲈鱼？
225
If two pounds of meat will serve 5 people, how many pounds will be needed to serve 13 people?
如果 2 磅肉可供 5 人食用，那么供 13 人食用需要多少磅肉？
6 pounds
If a 4-pound roast takes 150 minutes to cook, how long should a five-pound roast take?
如果一块 4 磅重的烤肉需要 150 分钟烤熟，那么一块 5 磅重的烤肉需要多长时间？
187.5 minutes