One group at a time
Name the repeating group, find its value, divide the total by that value, then convert the group count to what the question asks for.
Questions in this lesson
Transcript
Bala has 3 times as many 10-cent stamps as 50-cent stamps. The total value of all his stamps is nineteen dollars and twenty cents. How many 10-cent stamps does he have? Try it first. Pause if you like. Build one group of stamps. For every one fifty-cent stamp, there are three stamps worth ten cents each. These four stamps make one group. Every group has exactly this combination. Write one group as three at ten cents and one at fifty cents. Now find the value of one group. The three ten-cent stamps cost three times ten cents, which is thirty cents. The fifty-cent stamp is worth fifty cents. Value of one group is zero point three zero plus zero point five zero, which is eighty cents. The bar shows the total value of all the stamps. All the stamps are worth nineteen dollars and twenty cents. Each group is worth eighty cents. Number of groups is nineteen point two zero divided by zero point eight zero, which is twenty four. Bala has twenty four of these groups. The marked part is one group, worth eighty cents. Each group holds three ten-cent stamps. These three. Number of ten-cent stamps is twenty four times three, which is seventy two stamps. Bala has seventy two ten-cent stamps. One group has one price. The total is a whole number of those prices. The ten-cent stamp count is three for each of those groups.