Question

a varies directly with b . The value of a is 20 when b = 2.5 .Find the value of a when b= 4 .​

Answer 1

Step-by-step explanation:

ANSWER IN ATTACHMENT

Answer 2

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● Answer -

a = 32 when a = 4

● Explaination -

● Explaination -

Given that a is in direct variation with b.

Given that a is in direct variation with b.a ∝ b

Given that a is in direct variation with b.a ∝ ba = kb

Given that a is in direct variation with b.a ∝ ba = kbFor a = 20, b = 2.5.

Given that a is in direct variation with b.a ∝ ba = kbFor a = 20, b = 2.5.20 = k × 2.5

Given that a is in direct variation with b.a ∝ ba = kbFor a = 20, b = 2.5.20 = k × 2.5k = 20 / 2.5

Given that a is in direct variation with b.a ∝ ba = kbFor a = 20, b = 2.5.20 = k × 2.5k = 20 / 2.5k = 8

Given that a is in direct variation with b.a ∝ ba = kbFor a = 20, b = 2.5.20 = k × 2.5k = 20 / 2.5k = 8When b = 4,a = k × b a = 8 × 4a = 32

a = 8 × 4a = 32Hence , a is 32 when b is 4.