An auto mechanic has two bottles of battery acid. One bottle contains a 10% acid solution, and the other contains a 4% acid solution. How many units of each solution are needed to make 120 units of a 6% acid solution?

Step-by-step explanation:

An auto mechanic has two bottles of battery acid. One bottle contains a 10% acid solution, and the other contains a 4% acid solution. How many units of each solution are needed to make 120 units of a 6% acid solution?

Let the number of units for 10% = x

Let the number of unit of 4% = y

Hence:

x + y = 120... Equation 1

10% × x + 4% × y = 6% × 120

0.10x + 0.04y = 7.2 Equation 2

x=12 units bd= 10 units

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