\( 1 \frac { 2 } { 5 } \div \{ 2 \frac { 3 } { 5 } - ( \overline { 1 \frac { 1 } { 4 } - \frac { 2 } { 3 } } \times 1 \frac { 1 } { 7 } ) \} \)

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?

За 14 дней 9 рабочих выпол- нили \( \frac{7}{12} \) задания. Сколько рабочих необходимо нанять дополнительно, чтобы вы- полнить оставшуюся часть задания за 6 дней? (4)

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 \( \frac{3}{9} \)