Answer

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**Hint:**In solving this question, we will first convert the weight of one plastic bead that is 20 milligrams in grams. After that, we will find out the weight in grams for strings containing beads of 120 in number by multiplying the term 20 with 120. After multiplying them, we will get the answer in grams. We will see the alternate method to solve this question.

**Complete step by step solution:**

Let us solve this question.

In this question, it is given that one plastic bead weighs 20mg. That means the weight of a plastic bead is 20 mg. We have to find the weight of a string containing 120 beads of the same weight. As it is given in the question that we have to find the weight in grams, so we will first convert the weight of one bead in grams. Here, we will suppose that the weight of the string is negligible.

It is given that the weight of one bead is 20 mg.

We will first convert the weight in grams.

We know that 1 gram is equal to 1000 milligrams or 1 milligram is equal to 0.001 grams.

So, weight of one bead in grams will be 20 multiplied by 0.001 that is 0.02 grams

Hence, the weight of 120 beads in grams will be 120 multiplied by 0.02 that is 2.4 grams

Therefore, the weight of string containing 120 beads is 2.4 grams

**Note:**

We can solve this question by alternate method. We will first find the total weight of 120 plastic beads if the weight of one bead is 20 mg.

So, the weight of 120 beads in milligrams will be 120 multiplied by 20 that is 2400 milligrams.

We know that 1 gram is equal to 1000 milligrams.

Hence, we can write 2400 milligrams as 2400 divided by 1000 in grams.

So, 2400 milligrams will be 2.4 grams

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