Question

A town needs around $470$ million litres of water to meet the daily needs of the entire population of the town . How many litres of water does the town require to meet the demand of the people for a year?

• A. $1.6155\times {10}^{11}\text{litres}$
• B. $1.7155\times {10}^{11}\text{litres}$
• C. $1.5145\times {10}^{12}\text{litres}$
• D. $2.1235\times {10}^{12}\text{litres}$

Answer 1

The correct option is B $1.7155\times {10}^{11}\text{litres}$

Daily need of water = $470$ million litres
$=470\times {10}^6=47\times {10}^7$

Number of days in a year $=365$
So, required amount of water for a year $=47\times {10}^7\times 365$
$=17155\times {10}^7=1.7155\times {10}^{11}\text{litres}$