En algunas partes del mundo, las distancias de viaje aparecen en kilómetros en las señales
de las carreteras y los mapas. ¿Cuántos
metros hay en 3.5 kilómetros?
(1 kilómetro = 1,000 metros)

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.