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primary 6 | Maths
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i got answer 5:3. The answer sheet says 5:2
Date Posted: 2 years ago
Views: 293
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Using trial and error and confirmation method:
every 7 tables there are 25 chairs.
If each 3 tables has 5 chairs, then 4 tables has 3 chairs, then
3*5 + 4*3 = 27 not equal to 25
similarly, try
2*5chairs + 5*3chairs = 25 chairs
You get 2 : 5
Using the calculation method:
'a' tables has 3 chairs
'b' tables has 5 chairs
total no of chairs = 3a + 5b
total no of tables = a + b
a + b = 7
3a + 3b = 21
3a + 5b= 25
2b = 4
b = 2
a = 7-2 = 5
total no of chairs = 3chairs*(5 tables) + 5chairs*(2 tables)
therefore ratio of tables is 2 : 5
every 7 tables there are 25 chairs.
If each 3 tables has 5 chairs, then 4 tables has 3 chairs, then
3*5 + 4*3 = 27 not equal to 25
similarly, try
2*5chairs + 5*3chairs = 25 chairs
You get 2 : 5
Using the calculation method:
'a' tables has 3 chairs
'b' tables has 5 chairs
total no of chairs = 3a + 5b
total no of tables = a + b
a + b = 7
3a + 3b = 21
3a + 5b= 25
2b = 4
b = 2
a = 7-2 = 5
total no of chairs = 3chairs*(5 tables) + 5chairs*(2 tables)
therefore ratio of tables is 2 : 5
Date Posted:
2 years ago
done
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Answer is 2:5
Date Posted:
2 years ago
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