Question

1. Reduce each of the following ratio to their lowest terms:
(i) 1 hour 20 min: 2 hours
(ii) 4 weeks : 50 days
(iii) 3 years 4 months : 5 years 5 months

2. The strength of a class is 90, including 30 girls. Find the ratio of number of:
(i) girls to boys
(ii) boys to the whole class
(iii) the whole class to girls

3. Two numbers are in the ratio 9:5. If the smaller number is 40 find the other number

4. The length of a pencil is 18cm and its radius is 4cm. Find the ratio of its length to its
diameter.

IT'S VERY URGENT ​
I WANT ANSWERS FOR ALL THE QUESTIONS

Answer 1

Step-by-step explanation:

• i) 1hour include 60 min+20=80
• 2hours :60×2=120min
• 80:120=2:3

• ii) 4 weeks include 4×7 =28days
• 28:50=14:25

• iii) 3years include 12×3=36+4=40 months
• 5years include 5×12+5=65
• 40:65=8:13

Q. 2. :-total students =90

• 30 girls and 60 boys

• 1 . girls to boys =30:60=1:2
• 2.boys to whole class =60:90=2:3
• 3.whole class to girls =90:30=3:1

Q. 3. ratio =9x and 5x

• smaller =5x=40
• x =40÷5=8
• another number =9×8=72

• Q.4. length =18cm
• radius = 4cm
• diameter =2×radius =4×2=8cm

• length : diameter=18:8=9:4.