107
CH 18  I’M THINKING
OF A NUMBER
For each problem, I’m thinking of a number. Use the clues in the
problem to find that number.
1.
If I multiply the number by 5, and then subtract 2, the final
result will be 3.
2.
If 41 is added to the number, and then that result is
divided by 7, the final answer is 6.
3.
If 15 is added to the number, and then that result is
divided by 9, the final answer is 2.
4.
If I multiply the number by 9, and then add 4, the final result will be
22.
5.
If 2 is subtracted from the number, and then that result is multiplied
by 4, the final answer is 4.
6.
If I multiply the number by 3, and then subtract 4, the final result will
be 26.
7.
If 84 is added to the number, and then that result is divided by 10, the
final answer is 9.
8.
If 7 is added to the number, and then that result is divided by 3, the
final answer is 3.
9.
If I multiply the number by 6, and then add 11, the final result will be
53.
Ch 18  I’m Thinking of a Number
108
10.
If I divide the number by 2, and then subtract 1, the final result will be
4.
11.
If I multiply the number by 3, and then add 5, the final result will be
23.
12.
If I multiply the number by 4, and then add 1, the final result will be
33.
13.
If I divide the number by 6, and then add 6, the final result will be 8.
14.
If 3 is added to the number, and then that result is multiplied by 2, the
final answer is 8.
15.
If I divide the number by 7, and then subtract 1, the final result will be
2.
16.
If 5 is added to the number, and then that result is divided by 6, the
final answer is 2.
17.
If I multiply the number by 7, and then add 9, the final result will be
30.
18.
If 4 is subtracted from the number, and then that result is multiplied
by 2, the final answer is 8.
19.
If I multiply the number by 3, and then
subtract 6, the final result will be 9.
Algebra Preview:
20.
If 9 is added to the number, and then that
result is multiplied by 4, the final answer is 40.
Problem 21 can be
converted into the
equation
21.
If I multiply the number by 7, and then add 5,
the final result will be 33.
22.
If 35 is added to the number, and then that
result is divided by 5, the final answer is 8.
Ch 18  I’m Thinking of a Number
7n + 5 = 33
which we’ll learn how
to solve later in this
course.
109
23. If 6 is subtracted from the number,
and then that result is multiplied by 2, the
final answer is 4.
24. If 4 is added to the number, and then
that result is multiplied by 6, the final
answer is 66.
25. If I divide the number by 5, and then
add 4, the final result will be 12.
26. If I divide the number by 8, and then
subtract 5, the final result will be 3.
27.
If 2 is subtracted from the number, and then that result is divided by 2,
the final answer is 4.
28.
If 3 is subtracted from the number, and then that result is divided by 2,
the final answer is 1.
Solutions
1.
1
2.
1
3.
3
4.
2
5.
3
6.
10
7.
6
8.
2
9.
7
10.
10
11.
6
12.
8
13.
12
14.
1
15.
21
16.
7
17.
3
18.
8
19.
5
20.
1
21.
4
22.
5
23.
8
24.
7
25.
40
26.
64
27.
10
28.
5
Ch 18  I’m Thinking of a Number
110
“Knowledge speaks,
but wisdom listens.”
Jimi Hendrix
Ch 18  I’m Thinking of a Number