Question

a man and his son have some greeting cards with each of them if the man gives 15 greeting cards to his son they will have equal number of greeting cards but if the sun gives 15 greeting cards to man the man will have three times as many greeting cards as the son will have how many greeting cards do they have together?​

Answer 1

Answer:

120 cards

Step-by-step explanation:

let the no. of cards with man and son be x and y

x-15=y+15

x=y+30     ----1

also x+15= 3(y-15)

x=3y-45-15

x=3y-60

from 1

y+30=3y-60

2y=90

y=45

from 1

x=75

x+y=45+75=120 cards

Answer 2

Answer:

The answers are 75 cards with man and 45 cards with son and they have total 120 cards.

Step-by-step explanation:

let the man has  X  cards and the son ha Y cards

According to the given condition

X - 15 = Y + 15

Therefore   X - Y = 30 ..........1

According to the second condition

3 ( Y - 15 ) = X + 15

Therefore  - X + 3Y = 60...........2

Add equation 1 and 2 and you get

Y = 45

Therefore substitute Y = 45 in equation 1

X - 45 = 30

X = 30 + 45

X = 75

Hope this will help, feedbacks are always welcome.