Yusuf tried to solve an equation step by step. \qquad\begin{aligned} \dfrac14r+2&=10\ \\ \dfrac14r&=12&\green{\text{ Step } 1}\ \\ r&=48&\blue{\text{Step } 2}\ \end{aligned} 4 1 r+2 4 1 r r =10 =12 =48 Step 1 Step 2 Find Yusuf's mistake.

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