Question

three years ago the average of a and b is 20 years.now c has joined them and their average age became 25 years .what is the present age of c in years​

Answer 1

Answer:

Step-by-step explanation:

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Answer 2

$\bold \green{\underline {Step\:by\:step\:explanation:-}}$

$\leadsto \frac{a -3 + b - 3 }{2}=20$

$\leadsto a + b - 6 = 40$

$\leadsto a + b = 46$

$\leadsto \frac{a + b + c}{3} = 25$

$\leadsto 46 + c = 75$

$\leadsto \red{c = 29}$