Question

The value of a number triples on the second day, decreases by half from second to third day. It then increases by half of the increase from the first day to the second day on the fourth day. If this cycle repeats and the value of the number is 375 after 10 days, what was the initial value (on first day)?

Answer 1

I can't understand the question

Answer 2

first increased by 10% and then decreased by 10%

let her salary be 100

10% = 10/100 = 1/10

so 10% of 100 = 10

new salary after increase= 100 + 10 = 110..

now 10% of 110 is 11

so new salary after decrease is 110 -11 = 99

1 loss on 100 means 1%

OR

20 =1/5 means 20% of 5 = 1

similarly 25% = 1/4 means 25 percent of 4 is 1

10% = 1/10 .. 10 percent of 10 is 1

10% increase means

initial salary was 10 now its 11(10+1)..[1 is 10% of 10 as explained above]

10 % decrease means initial salary was 10 new is 9 (10–1)

now its like

initial salary new salary

10 11

10 9

100 99 [ 10*10 11*9]

loss of 1 over 100 means 1%