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------------------------------------------------ How many envelopes can be made out of a sheet of paper 72 cm by 48 cm if each envelope requires 18 cm by 12 cm?
a) 8
b) 12
c) 16
d) 24

To find the number of envelopes that can be made from a sheet of paper, we divide each dimension of the paper by the corresponding envelope dimension and multiply the results together. From a 72 cm by 48 cm sheet of paper, 16 envelopes of 18 cm by 12 cm can be made.

Explanation:

To solve this problem, we need to determine how many small rectangles of size 18 cm by 12 cm can fit into a larger rectangle of size 72 cm by 48 cm. To do this, we divide the dimensions of the larger sheet by the dimensions of the smaller envelope size.

First, let's calculate how many 18 cm widths can fit in the 72 cm side of the paper:
72 cm ÷ 18 cm = 4
Next, calculate how many 12 cm lengths can fit in the 48 cm side of the paper:
48 cm ÷ 12 cm = 4

By multiplying the number of widths by the number of lengths, we get the total number of envelopes that can be made:

4 widths × 4 lengths = 16 envelopes

Therefore, the answer is c) 16.