3 is the total dollars 1 magazine cost
4 is the total of paperback books she bought
5 is the total dollars 1 paperback book cost
multiply 4 by 5 to get total cost of the 4 paperback books and add 3 of the total cost of the magazine to get the total cost of everything
Without experience that would help you recognize it right away, I think
you would just need to try numbers until you find it.
Pick a number, multiply it by itself with pencil and paper, and see if it works.
(2)² = 4 too small
(3)² = 9 too small, and not growing fast enough; this could take all day
(10)² = 100 still too small
(15)² = 225 oops, too big; go back down
(12)² = 144 too small
(14)² = 196 too big
(13)² = 169 just right; hope the bears don't come back too soon
27 divided by 3 is 9
48 divided by 3 is 16
9/16
Answer:
f^-1 (x)=x/3
Step-by-step explanation:
y=3x
x=3y
y=x/3
2 out of 50 are defective.
Divide 2 by 50: 2/50 = 0.04
Now multiply the total quantity by that:
2000 x 0.04 = 80
80 are likely to be defective.
