Mrs Goh baked 412 more cookies than Cindy. After Mrs Goh sold 172 of her cookies, she had 4 times as many cookies as Cindy.
- How many cookies did Cindy bake?
- How many cookies did Mrs Goh bake?
| |
Cindy |
Mrs Goh |
| Before |
1 u |
1 u + 412 |
| Change |
|
- 172 |
| After |
1 u |
1 u + 240 |
(a)
After
Number of cookies that Cindy had = 1 u
Number of cookies that Mrs Goh had = 4 x 1 u = 4 u
Before
Number of cookies that Cindy baked = 1 u
Number of cookies that Mrs Goh baked = 1 u + 412
4 u = 1 u + 412 - 172
4 u - 1 u = 240
3 u = 240
1 u = 240 ÷ 3 = 80
Number of cookies that Cindy baked
= 1 u
= 80
(b)
Number of cookies that Mrs Goh baked
= 1 u + 412
= 80 + 412
= 492
Answer(s): (a) 80; (b) 492
