Ok so, adam had 91 dollars. if he spent 21 dollars on new books, what is the ratio of money he still has, to money he's spent. the answer is 10: 3, but i need a show your work example from somebody! !

Step-by-step explanation:

Let

x ----> the money Adam still has

y ---> the money Adam spent

r ---> the ratio of money he still has, to money he's spent.

we know that

The money Adam still has is the same as the money he originally had minus the money he spent.

so

we have

Find the ratio

Simplify

Divide by 7 both numerator and denominator

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.