You and a friend baked 400 cupcakes together. if your friend baked 60% of the cupcakes, how many cupcakes did you bake?

160 cupcakes

If your friend baked 60% of 400 total, that means that the remaining amount of cupcakes that you baked is 100% – 60% = 40%. So, we must find 40% of 400

To do this, first we must convert 40% into decimal form. We can do this by dividing it by 100:    40 ÷ 100 = 0.4

Then, "of" usually means multiplication. In this case, it does, so to find 40% of 400, we must calculate 0.4 • 400

0.4 • 400 = 160, so you baked 160 cupcakes

Your friend baked 60% so (60/100) x 400 = 240

400 - 240 = 160