Answer:
21 days. Friday
Step-by-step explanation:
In ordet o solve this, you know that there is a separation of 7 days between friday and friday, and that´s the number for tennis, and there is 3 days between the days she plays basketball, so you ned the minimum common factor which is given by multiplyign 7*3 which would be 21, so after 21 days she will play again basketball and tennis on a friday.
