Question

isabelle wanted to arrange her football cards in pairs but on card is short she tried in fived but still one card short she arranged her cards in sevens what is the least number of cards she could've had?

Answer 1

x mod 2= 1, x mod 5=4 , x mod 7 =0

Answer 2

if u dont no mod u can do guess and check that works too for a question like this

Answer 3

multiples of 7
7
14
21
28
35
42
49 <---- 49/2= 29 and 1/2 so, and 49/5= 9 and 4/5

Answer 4

@ganeshie8 how to solve this with mods