Opal, Lynn and Harry baked some biscuits. Opal and Lynn baked
34 of the biscuits. Lynn and Harry baked
25 of the biscuits. Opal and Harry baked 391 biscuits altogether.
- What fraction of the biscuits did Opal and Harry bake altogether?
- How many biscuits did the three girls bake in total?
| Opal |
Lynn |
Harry |
Total |
| 3x5 |
1x5 |
4x5 |
| 3x4 |
2x4 |
5x4 |
| 12 u |
3 u |
5 u |
20 u |
(a)
The total number of biscuits remains unchanged. Make the total number of biscuits the same. LCM of 4 and 5 is 20.
Number of biscuits baked by Lynn
= 8 u - 5 u
= 3 u
Number of biscuits baked by Opal and Harry
= 12 u + 5 u
= 17 u
Total number of tarts = 20 u
Fraction of the biscuits baked by Opal and Harry =
1720(b)
Total number of biscuits baked by Opal and Harry = 17 u
17 u = 391
1 u = 391 ÷ 17 = 23
Total number of biscuits the three girls baked
= 20 u
= 20 x 23
= 460
Answer(s): (a)
1720; (b) 460
