On the island of foo, the natives use a counting system based on colored pebbles. In this system A red pebble is equal to 3 yellow pebbles A blue pebble is equal to a red pebble and 2 yellow pebbles A green pebble is equal to 3 red pebbles what is the value in pebbles of a green and a blue pebble divided by 2 red pebbles and a yellow pebble? 1/ 2 yellow pebbles 2/ 1 red pebble

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