What is the correct answers ?

Question

3. Malin uses a piece of wire 80cm long to form a rectangle. The length of the rectangle is 12cm longer than its breadth. Find the length and the breadth of the rectangle. 4.Nita had $10m. After buying some books at $15 each, she had $4m left. a. Find the number of books Nita bought in terms of m. b.If m =30, how many books did Nita buy? 5. LyLy. Joly and Taly saved $200 altogether. LyLy saved $20 more than Taly, Joly saved 3 times the amount Taly saved. How much did LyLy save?

Answer 1

L=12+B

2(L+B)=80

2(12+B + B) = 80

24 +4B = 80

4B = 80-24= 56

B = 56/4 = 14 cm

L=12+B = 12+14=26 cm

10m-15x=4m

6m=15x

m=15x/6 =5x/2

where x = number of books purchased

10(5x/2) - 15x = 4(5x/2)

25x - 15x = 10x

10x=10x

if m=30 =5x/2

5x=60

x=12

L=20+T

T=L-20

J=3T

J=3(L-20)

J=3L-60

3L=J+60

L=J/3 + 20

Lyly saved 20 more than 1/3 of what Joly saved