We bought orange juice and apple juice at the store. A bottle of orange juice costs 70 cents and a bottle of apple juice costs 60 cents. We bought a total of 70 bottles for $46.20. How many bottles of orange juice did we buy?  Choose the correct choice from the following options.
A) 32 B) 36 C) 38 D) 42 E) 48
Let OJ be the bottles of orange juice and let AJ be the bottles of apple juice.   (OJ) + AJ = 70.   AJ = 70 - (OJ).   70(OJ) + 60AJ = 4620.   70(OJ) +60(70-OJ) = 4620.   10(OJ) + 4200 = 4620.   OJ = 42.   The answer is 42.
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We bought orange juice and apple juice at the store. A bottle of orange juice costs 70 cents and a bottle of apple juice costs 60 cents. We bought a total of 70 bottles for $46.20. How many bottles of orange juice did we buy?