Question

a varies directly with b. The value of a is 20 when b=25. Find the value of a when b = 4​

Answer 1

Answer:

80/25 or 16/5 or 3.2

Step-by-step explanation:

Take the number in fractions as a column 'b' which has fraction 25/4 and column '20/x' x is there because we need to find it out and since this is a case of direct variation convert them into ratio as 25:4=20:x and then to find x multiply the extremes and the middle numbers like 4*20=25x

then simplify and you get your answer