Question

an amount becomes 6 times in 7 years when invested under s.i. at a certain rate in how many years will the amount become 16 times of the original amount at the same rate

Answer 1

There's a hack to approach this kind of question. It's very simple.
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For SI :
If a sum of money becomes X times in T years. In how many years will it become y times?
The formula is = [(y - 1) /(x - 1)] × T
Substitute the given values in the formula and we'll get the required answer.
=> [(16 - 1) / (6 - 1)] × 7
=> (15/5) × 7
=> 3 × 7
=> 21 years.
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Answer 2

Answer:

21 years

Step-by-step explanation:

There's a hack to approach this kind of question. It's very simple.

_____________________________

For SI :

If a sum of money becomes X times in T years. In how many years will it become y times?

The formula is = [(y - 1) /(x - 1)] × T

Substitute the given values in the formula and we'll get the required answer.

=> [(16 - 1) / (6 - 1)] × 7

=> (15/5) × 7

=> 3 × 7

=> 21 year