Rinki donates blood thrice in a year, each time 150 millilitres. How many litres of blood will he donate in 5 years?

Correct option is C

Given:

Donations per year = 3 times

Blood donated per time = 150 millilitres

Total years = 5 years

Solution:

Blood per year (ml) = Donations per year × Blood donated per time

Blood per year (ml) = 3 × 150 ml = 450 ml

Total blood donated in 5 years (in millilitres):

Total blood (ml) = Blood per year (ml) × Total years

Total blood (ml) = 450 ml × 5 = 2250 ml

Convert the total blood donated from millilitres to litres:

Total blood (L) $$= \frac{\text{Total blood (ml)} }{ 1000}$$​​

Total blood (L) = $$\frac{2250 }{ 1000}$$​​ = 2.25 L

Rinki will donate 2.25 litres of blood in 5 years.