Answer:
B
Step-by-step explanation:
Assume both their ages are 
One is 3 years older than the other, and the sum of their ages add up to 19

Answer:
correct
Step-by-step explanation:
you got it right
ANSWER:
143 - b
STEP-BY-STEP EXPLANATION:
Given:
Original quantity: 143
Amount given away: b
The amount of cards Ruben has today will be equal to the difference between the original amount and the given amount, it will be written as the following expression:
(9^2)+(22^2)=x^2
81+484=x^2
565=x^2
x is approximately 24 units