Question

Plz Answer this Question ​

Answer 1

Step-by-step explanation:

3a÷7=8÷5

3a×5=8×7

3a×5=56

3a=56÷5

3a=11.2

a=11.2÷3

a=3.733

Answer 2

Step-by-step explanation:

Given:-

3a:7=8:5

To find:-

Find the value of a?

Solution:-

Given proportion is 3a:7=8:5

Method -I:-

3a:7=8:5

=>3a/7=8/5

On applying cross multiplication then

=>3a×5=8×7

=>15a=56

=>a=56/15

The value of a=56/15

Method-II:-

Given proportion is 3a:7=8:5

Product of extremes=3a×5=15a

Product of means=8×7=56

In proportion,

Product of extremes= Product of means

=>15a=56

=>a=56/15

Answer:-

The value of a for the given problem=56/15

Used formulae:-

• Equality of ratios is called Proportion.
• Product of extremes=Product of means