Answer: 35 cupcakes
Step-by-step explanation: If a bakery sells 5 cupcakes for every 3 cupcakes, then use this ratio of (5 : 3). Now, that we know that 21 cookies were sold on Saturday, divide 21 by 3, which equals to 7. Lastly, multiply 5 x 7, which gives us a final result of 35 cupcakes.
Extra Work: You don’t have to do this, but the ratio would be (35 : 21), as a final result.