MATHEMATIC QUESTION (RATIO) !!

[匿名]

2008-12-13 6:07 pm

1. In a company, the ratio of the number of male staff to the number of
female staff is 5：6.If there are 5 more female staff than male staff,
find the total number of staff.

2. Some peanuts are divided between two children in the ratiio 5 : 7 .If one
child gets 10 peanuts less than the other , find the total number of peanuts.

3. A rectangular garden is 25 m long and 20m wide.find the ratio of the
length to its perimeter.

4. The height of the Eiffel Tower (埃斐爾鐵塔) in Paris is 298 m. it is
252m taller than the Statue of Liberty (自由神像)in USA. Find the ratio
of the height of the Eiffel Tower to that of the Statue of Liberty in the
form x : 1. (Give the value of x correct to 2 sig.fig.)

回答 (1)

Uncle Michael

2008-12-14 5:12 am

✔ 最佳答案

1.
Let m be the number of male staff.
Then, number of female staff = m + 5

Number of male staff : Number of female staff
m : m + 5 = 5 : 6
m/(m + 5) = 5/6
6m = 5(m + 5)
6m = 5m + 25
m = 25

Total number of staff
= m + (m + 5)
= 25 + (25 + 5)
= 55

=====
2.
Let n and (n + 10) be the numbers of peanuts that the two children get.

n : n + 10 = 5 : 7
n/(n + 10) = 5/7
7n = 5(n + 10)
7n = 5n + 50
2n = 50
n = 25

Total number of peanuts
= n + (n + 10)
= 25 + (25 + 10)
= 60

=====
3.
Length
= 25 m

Perimeter
= 2(25 + 20) m
= 90 m

Length : Perimeter
= 25 m : 90 m
= 5 : 18

=====
4.
Height of Eiffel Tower : Height of the Statue of Liberty
= 298 m : (298 - 252) m
= 298 : 46
= 6.5 : 1
=

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