Question

martha has 20 kilograms of rice for sale. She placed these in plastic bags. Each bags contains 2 1/2 kilograms. How many bags did she use?

Answer 1

Answer:

20 ÷ 2 $\frac{1}{2\\}$ = 20 ÷ 5/2 = 20 x 2/5 = 40/5 = 8 bags

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Answer 2

Given : Martha has 20 kilograms of rice for sale.

She placed these in plastic bags.

Each bags contains 2 1/2 kilograms.

To Find :  How many bags did she use

Solution:

Each bags contains 2 1/2 kilograms.

=> Each bags contains = (2 * 2 + 1)/2  = 5/2  kg

Assume that She used n  bags

Rice in 1 bag  = 5/2  kg

Rice in n  bags  = 5n/2  kg

Rice = 20 kg

Equate

5n/2  = 20

=> 5n = 20 * 2

=> n = 4 * 2

=> n = 8

She used 8 bags

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