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Question
primary 6 | Maths
| Ratio
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Date Posted: 4 years ago
Views: 227
6A: 8u
6B = 76-8u
5/8 of 6A = 5u
3/4 of 6B = 57 - 6u
5u + 57 - 6u = 52
u = 5
no. of pupils in 6B is 36
...
6B = 76-8u
5/8 of 6A = 5u
3/4 of 6B = 57 - 6u
5u + 57 - 6u = 52
u = 5
no. of pupils in 6B is 36
...
See 1 Answer
OR
Algebra method
8a+4b=76
5a+3b=52
→
(1) 5×8a+5×4b=5×76
(2) 8×5a+8×3b=8×52
→ (2) - (1)
24b - 20b =
4b = 8×52-5×76
= 36 (Ans)
Algebra method
8a+4b=76
5a+3b=52
→
(1) 5×8a+5×4b=5×76
(2) 8×5a+8×3b=8×52
→ (2) - (1)
24b - 20b =
4b = 8×52-5×76
= 36 (Ans)
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