Ritu, Saru, Janhavi and Bina 7, 8, 9 and X years old respectively their average is 10 find bina age
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Answer: Given,
There are four girls & average is 10.
= 4×10 = 40.
Now, 7+8+9= 24
Then, 40-24 = 16.
Hence, bina age is 16 years.
PROOF,
7+8+9+16/4
= 10
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