Question

plzz answer maths ratio and proportion

Answer 1

A ratio is a relationship between two values. For instance, a ratio of 1 pencil to 3 pens would imply that there are three times as many pens as pencils. For each pencil there are 3 pens, and this is expressed in a couple ways, like this: 1:3, or as a fraction like 1/3. There do not have to be exactly 1 pencil and 3 pens, but some multiple of them. We could just as easily have 2 pencils and 6 pens, 10 pencils and 30 pens, or even half a pencil and one-and-a-half pens! In fact, that is how we will use ratios -- to represent the relationship between two numbers.

A proportion can be used to solve problems involving ratios. If we are told that the ratio of wheels to cars is 4:1, and that we have 12 wheels in stock at the factory, how can we find the number of cars we can equip? A simple proportion will do perfectly. We know that 4:1 is our ratio, and the number of cars that match with those 12 wheels must follow the 4:1 ratio. We can setup the problem like this, where x is our missing number of cars:

Answer 2

6. Amit-180 Nitin-120.
7. 20rs:30rs.
8. 25m.
9. 200.
10. a,b,c are in proportion.
11. 30 envelopes.
12. 3kg tomatoes for Rs. 19.50 is better buy.
5litre oil for Rs. 200 is better buy.
13. a) 25000Rs.
b)19months.
14. 57.5 Rs.
15. 98km.
16. 12 bananas or 1 dozen banana.