It is: 21/162 = 7/54
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To simplify the fraction 90/162, you can first find the greatest common divisor (GCD) of 90 and 162, which is 18. Divide both the numerator and denominator by the GCD to get the simplified fraction. So, 90/162 simplifies to 5/9.
10.125
117/162 = 13/18
Each term is 3 times greater than the previous term and so the next term will be 486
126 divided by 7/9 = 162