Question

use number sense Duane and Mick are saving their money to build a tree house.Duane adds $5. ti their piggy bank every other week Mick adds $2.every week.So far they have saved $45.How many weeks have they been saving money?

Answer 1

Duane and Mick have been saving money for 10 weeks.

Work

W1 5+2=7
W2 0+2=2
W3 5+2=7
W4 0+2= 2
Total so far is 18
W5 5+2 = 7
W6 0+2 = 2
W7 5+2 = 7
W8 0+2 = 2
Total now is 36
W9 5+2 = 7
W10 0+2 = 2
You end at 45!

Answer 2

5 weeks
Work: (9×5=45
5+2}
2. }these 5+2+2=9
5+2
2
5+2
2
5+2
2
5+2
2