Question

A diver was collecting water samples from a lake. He collected a sample at every interval of 3m, starting at 5 m below the water surface. The final sample was collected at a depth of 35 m. How many symbols did he collect?

Answer 1

$\color{Blue}\huge{Answer}$

• 1st sample  collected at 5 m

• 2nd sample collected at 5 + 3 1  m

• 3rd sample collected at 5 + 3 2  m

Hence nth sample collected = 5 + 3*(n -1 )  m

5 + 3(n -1 ) = 35

• n - 1 = 10

• n = 11

Hence 11 samples collected.

Answer 2

Answer:

1st sample collected at 5 m

2nd sample collected at 5 + 3 1 m

3rd sample collected at 5 + 3 2 m

Hence nth sample collected = 5 + 3*(n -1 ) m

5 + 3(n -1 ) = 35

n - 1 = 10

n = 11

Hence 11 samples collected.