Please help me to to solve this quadratic equation word problem.

Question

Here is the question:

The Abacus. The Chinese abacus consists of a frame, parallel wires, and beads that are moved to perform arithmetic computations. The frame is 21 Centimeters longer than it is high, which is 39 cm. Find its height and length.

Answer 1

height=39
length = height+21 = 39+21 = 60

Answer 2

Thank you Steve.