Bayaraa bought a new piece of land that was 168 meters wide and 189 meters long. He already owned and that was two-quarters the width and one-third the length of the new piece of land. What is the sum of the widths of the two pieces of land?

7. \( \left(\frac{1}{2}+\frac{3}{20}\right)-\frac{2}{20} \)

A lab technician is dividing a cell that has a diameter of \( 4.32 \times 10^{-4} \) millinijeters. Each of the new cells has a diameter measuring exactly one half of the diameter of the original cell. Which is the diameter of a new cell?

1. Three friends Manu, Gopi, and Siri share their water bill in a ratio of \( 1: 2: 3 \). a) How much do Manu and Siri pay? b) What is the cotal cost of the bill? c) Manu pays how much less than Siri?

2) QUESTÃO: Cinco torneiras identicas enche um tanque em 6 horas. Em quanto temp quatro (4) torneiras encheriam o mesmo tanque?

(i) \( \frac{-7}{21} \) and \( \frac{3}{9} \)