Answer:
9/40 of his salary
Step-by-step explanation:
You may want to add the fractions first or subtract one and then the other. I am going to add them first.
(3/8) + (2/5)
(15/40) + (16/40) = (31/40)
1 whole salary (40/40) - (31/40) = (9/40)
Since 9 and 40 have no common factors, the simplified answer is 9/40.
Answer:
27
Step-by-step explanation:
Let x represent the number of $0.15 stamps Ivan bought. Then the value of his stamps is ...
0.15x +0.40(35-x) = 7.25
-0.25x +14.00 = 7.25 . . . . . eliminate parentheses, collect terms
-0.25x = -6.75 . . . . . . . . . . . subtract 14.00
x = 27 . . . . . . . . . . . . . . . . . . divide by -0.25
Ivan bought 27 $0.15 stamps.