How many hats did the knitter who sold 9 scarves sell? Scarves
10
9-
8-
7
6
5
4
3
2
1
0
0 1 2 3 4 5
6 7 8 9 10
Hats
O 2
3
04
6

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of