Question

The sum of the ages of three persons is 100yrs. What will be the sum of their ages after 5 years.

for tho question how can we form an equation

Answer 1

let the current ages of the three persons be X Y and Z respectively
according to question X + Y + Z is equal to 100

after 5 years the ages of the three persons will be X + 5 ,Y + 5 and Z + 5 respectively
therefore sum of their ages after 5 years is equal to X + 5 +Y + 5 + Z+5= X + Y + Z + 5 + 5 + 5
is equal 100 + 15 is equal to 115