Answer:
a. 5 sets of tires
b. 16 times
Step-by-step explanation:
total distance commuted by the truck = 160,000 miles
a.tires of the truck are changed after every 40,000 miles
40,000 to 80,000 to 120,000 to 160,000 he will change his tires four times assuming he started his journey with the new tires. so, he needs uses a total of 5 sets of tires for the whole journey.
b. changes oil every 10,000 miles then to travel 160,000 miles
=
= 16 times in whole journey
So to find how many tenths, or 1/10's, there are in four fifths, or 4/5, divide 4/5 by 1/10.
Now, remember that <u>dividing by a number is equivalent to multiplying by its reciprocal</u>. To find the reciprocal, just flip the numerator and denominator around. In this case, 1/10 would become 10/1. Flip 1/10 to its reciprocal, change the sign to multiplication, and multiply numerators with numerators and denominators with denominators:
<u>In short, there are 8 tenths in four fifths.</u>
