Question

Cindy needs to order 150 invitations which are sold in packs of 20. How many packs does Cindy need to buy?
A) 6
B) 7
C) 8
D) 9

Answer 1

the answer is 8 because:
you need 5 packs of 20 to get to 100 and then you still need 50 more so you have to get three more packs to make it to 150 and then you have some invitations left over but thats okay.

Answer 2

The question is an illustration of divisions.

Cindy needs to buy (c) 8 packs

The given parameters are:

$\mathbf{Invitation = 150}$

$\mathbf{Pack = 20}$

The number of packs is calculated by dividing the total number of invitation by the number of invitations in each pack.

So, we have:

$\mathbf{n = \frac{Invitation}{Pack}}$

$\mathbf{n = \frac{150}{20}}$

$\mathbf{n = 7.5}$

Cindy needs 7.5 packs.

Since the packs cannot be split, Cindy must buy the closest number of packs greater than 7.5

So, we have:

$\mathbf{n = 8}$

Hence, Cindy needs to buy (c) 8 packs

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