Mrs Ng baked 304 more cookies than Olivia. After Mrs Ng sold 138 of her cookies, she had 3 times as many cookies as Olivia.
- How many cookies did Olivia bake?
- How many cookies did Mrs Ng bake?
| |
Olivia |
Mrs Ng |
| Before |
1 u |
1 u + 304 |
| Change |
|
- 138 |
| After |
1 u |
1 u + 166 |
(a)
After
Number of cookies that Olivia had = 1 u
Number of cookies that Mrs Ng had = 3 x 1 u = 3 u
Before
Number of cookies that Olivia baked = 1 u
Number of cookies that Mrs Ng baked = 1 u + 304
3 u = 1 u + 304 - 138
3 u - 1 u = 166
2 u = 166
1 u = 166 ÷ 2 = 83
Number of cookies that Olivia baked
= 1 u
= 83
(b)
Number of cookies that Mrs Ng baked
= 1 u + 304
= 83 + 304
= 387
Answer(s): (a) 83; (b) 387
