Traveling fifty thousand miles is a long time to spend in an airplane. Ten thousand dollars is a lot of money to spend on an education. Fractions modifying plural nouns take plural verbs Two thirds of the books have already arrived.
Fractions modifying and collective noun can take either singular or plural.
Two thirds of the population of Lebanon is Muslim. Two thirds of the population of Lebanon are Muslims. A noun will be either countable or uncountable. There are some general guidelines for figuring out which category a noun falls into, but many times you will simply have to memorize which nouns are countable and which are uncountable. Some information is out of place.