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sebastianapolo5
28.09.2019 •
Mathematics
1. solve for the variable in the following proportion.
n : 1/2 as 6 : 1 n=
2. solve for the variable in the following proportion.
1/4 is to 1 1/4 as 2 is to b b=
3. in a group of students, the ratio of girls to boys is 3 to 2.
if there are 15 girls, how many total students are there?
a) 10
b) 20
c) 25
d) 30
4. on a field trip, there are 12 adults and 14 students.
what is the ratio of the number of adults to the total number of people on the field trip?
a) 6 to 13
b) 12 to 14
c) 26 to 12
d) 6 to 7
5. if 2d = 5c, then all of the following are true except
a) 2/5= c/d
b) 5/2= d/c
c) 2/c= 5/d
d) 2/d= c/5
and hurry. i need the answer as soon as possible.
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Ответ:
1. n = 3
2. b = 9
3. C) 25
4. A) 6 to 13
5. D) 2/d= c/5
Step-by-step explanation:
1. n is proportional to 1/2 and 6 is proportional to 1, then:
n/6 = (1/2)/1
n = 3
2. 1/4 is proportional to 1 1/4 and 2 is proportional to b, then:
(1/4)/2 = (1 1/4)/b
b = (1 1/4)/[(1/4)/2]
b = 9
3. The next proportion must be satisfied:
(3 girls)/(2 boys) = (15 girls)/(x boys)
x = 15*2/3
x = 10 boys
total students: 15 girls + 10 boys = 25
4. There are 12 adults + 14 students = 26 people in the trip. Then, 12 adults to 26 people, dividing by 2, 12/2 = 6 adults to 26/2 = 13 people
5. Given 2d = 5c
dividing by 5 and by d at both sides: 2/5= c/d
dividing by 2 and by c at both sides: d/c = 5/2
dividing by d and by c at both sides: 2/c = 5/d
Ответ: