The ratio of 12 te 18 is, (a) \( 2: 9 \) (b) \( 3: 2 \) (c) \( 1: 1.6 \) (d) \( 1: 2 \)

68. Колико је: а) \( 12 \cdot(-4) ; \quad \) б) \( (-8) \cdot 11 ; \quad \) ц) \( (-2) \cdot(-37) \)

Ex 14 : Sand costs \( \$ 98.90 \) per tonne. This cost includes a tax of \( 15 \% \), Calculate the amount of tax paid per tonne of sand.

1. Which expressions are equivalent to \( 3 \frac{1}{4}-\left(-\frac{5}{8}\right) \) ? Select all that apply. A. \( 3 \frac{1}{4}-\left(\frac{5}{8}\right) \) B. \( 3 \frac{1}{4}+\left(\frac{5}{8}\right) \) C. \( 3 \frac{1}{4}+\left(-\frac{5}{8}\right) \) D. \( 3 \frac{1}{4}+\left(+\frac{5}{8}\right) \) E. \( -3 \frac{1}{4}+\left(-\frac{5}{8}\right) \) F. \( -3 \frac{1}{4}+\left(+\frac{5}{8}\right) \)

2074 Q.No. 1 A person drives a car between the two places \( x \) and \( y \). On his outward joumey he consumes 8 km per liter of petrol, on his return journey he covers 12 km per liter. Find the average of his mileage assuming the distance between the two places to be 100 kms .

Решите задачу: \( \left\lvert\, \begin{array}{l}\text { За три дня проложили } 112 \text { м кабеля. За первый } \\ \text { день проложили } \frac{4}{7} \text { кабеля, а за второй - } \frac{5}{12} \\ \text { оставшегося. Сколько метров кабеля проложили за } \\ \text { третий день? }\end{array}\right. \)