Of the 3 numbers whose average is 70, the first is 1/9 times the sum of other 2. The first number is
Let the three numbers be $$x,y,z$$
Sum of three numbers = $$x + y + z = 70 \times 3 = 210$$
According to ques, => $$x = \frac{1}{9} \times (y + z)$$
=> $$x = \frac{1}{9} \times (210 - x)$$
=> $$9x = 210 - x$$
=> $$9x + x = 10x = 210$$
=> $$x = \frac{210}{10} = 21$$
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