Answers as follows:
a) 30
b) 320
c) 160
d) 600
Step by step:
* is means equal
* of means multiply
* what number is represented by “x”
* rule for changing percent to decimal is to move the decimal point 2 places to the left.
a) 12 is 40% of what number?
12=.40 x
solve for x by dividing both sides by .40
30=x
b) 128 is 40% of what number?
128 = .40 x
Solve for x by dividing both sides by .40
320 = x
c) 240 is 150% of what number?
240 = 1.50 x
Solve for x by dividing both sides by 1.50
160 = x
d) 588 is 98% of what number?
588 = .98 x
Solve for x by dividing both sides by .98
600 = x