The rectangle is 18.4 cm long and 276 cm2 in area. How much should the length be increased

The rectangle is 18.4 cm long and 276 cm2 in area. How much should the length be increased so that, with the same width, the area increases to 300 cm2.

The length of the rectangle is 18.4 cm. The area is 276 cm2. To find the width, divide the area by the length:

276: 18.4 = 15 (cm) – the width of the rectangle.

Now we will find what the length should be in a rectangle with an area of 300 cm2 and a width of 15 cm:

300: 15 = 20 (cm) – required length.

Answer: 20 cm.