Answer: f(n+1) = 3 f(n)
Step-by-step explanation:
Given sequence : 2.5, 7.5, 22.5, 67.5, 202.5,...
Here,
Common ratio = 3
Let f(n) be a term in this sequence then the next term will be f(n+1) = 3 f(n), where n is a natural number .
Required recursive formula : f(n+1) = 3 f(n)
ATQ
With the help of the ratio method, we conclude that 72 grams of sugar should be added.
<h3>What is Ratio Method?</h3>So, 'n=5' will be the number of rings.
Let 's' be silver. Then,
Now, use the ratio method as follows:
Therefore, with the help of the ratio method, we conclude that 72 grams of sugar should be added.
Know more about Ratio Method here:
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The correct question is given below:
A jeweler has five rings, each weighing 18 grams, made of alloys of 10% silver and 90% gold. He decides to melt down the rings and add enough silver to reduce the gold content to 50%. How much silver should he add?