Q1.Aclassroomhasalength6mshorterthanitswidthandaperimeterof30m.Findthelengthandwidthoftheclassroom.Q2.Amanisfourtimesasoldashisson.Infiveyearshewillbeonlythreetimesasoldashisson.Whatistheman'spresentage

Question

Q1.A classroom has a length 6m shorter than its width and a perimeter of 30m.Find
the length and width of the classroom.
Q2.A man is four times as old as his son.In five years he will be only three times as old as his son.What is the man's present age?
Q3.A coffee blender mixes two types of coffee.Type A costs $13 per kg and type B
costs $18 per kg.How many grams of each type of coffee should be blended so that 1kg costs $15?

Answer 1

1、2×（X+Y）=30 X-Y=6 X=10.5 Y=4.5
2、4X+5=3×（X+5） X=10
3、13X+18Y=15 X+Y=1 X=0.6 Y=0.4