Question

hi please I need help with my mMATHEMATICS ASSIGNMENTS
1. Find the value of x and y in the following ratios
a. 3:5 = x:20
b.11:35 = 66: y
2. In a village of 375 children under the age of 10. If 68% of them have had malaria, how many children have escaped the disease?
3. Five buses need 3 trips to take 450 students to the stadium to watch a concert. How many trips would the 3 buses need to take the same number of students?
4. The ratio of girls to boys in a boarding school is 2:7. If there are 1,251 students in the school:
a. How many of the students are girls?
b. What percentage of the students are boys?
5. An old carpet which now costs #1 000, was sold for #1 400 when new. Calculate the percentage decrease.
6. The cost of petrol is #65 per litre. What is the percentage increase if it is sold for #105 per litre by a dealer during fuel scarcity?

Answer 1

Answer:

The answers are below

Explanation:

a)3:5

Multiply by 4

Answer =12:20

b) 11:35

Multiply by 6 on each side

Answer =66:210

2) 68% of 375=255

375-255=120

Answer is 120 people escaped malaria

3) 5*3=15

450/15=30

Answer=30

4) 1251/9=139

278:973

There are 278 girls in the school

Answer 2

Answer:

1

(a) Ans we are applying the formula

product of means = product of extremes

So according to the formula 5x = 60

x= 60/5

x = 12

(b) Ans we are applying the formula

product of means = product of extremes

2310=11 y

y = 2310/11

y = 210

Explanation:

(a)In product of means we multiply inner values with each other like in this case for solution of a part  5 and x are inner values and in product of extremes we multiply outer value like in case of solution for a 3 and 20 are outer values.