Math, asked by mrenu2480, 11 hours ago

ाँच छात्रों की आयु क्रमश: (2a + 5), (3a – 4), (a + 3), (2a – 5) और (2a + 6), है। उनकी आयु का औसत 21 है तो a का मान कितना होगा?​

Answers

Answered by anshu304272
0

Answer:

3

Step-by-step explanation:

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Answered by vikkiain
1

Answer:

a = 10

Step-by-step explanation:

average =  \\  \frac{(2a + 5) + (3a - 4 + )( a+ 3) + (2a - 5) + (2a + 6)}{5} = 21 \\   \frac{10a + 5}{5}  = 21 \\ 10a + 5 = 105 \\ 10a = 100 \\ a = 10.

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