Twenty of them.
15 of them.
twenty 4 x 10 = 40 = 2 x 20
Well, 25 twos is equal to 50. So 10 fives are equal equal to 25 twos.
2
6 fives
15
3
213 twos.
15 x 2 = 3030 = 5 x 6
8 (sum means add 2x10 +10x2 =40 then divide by 5 to find the amount of fives that fit=8)