Question

If a 100gm coffee powder contains 40mg caffeine then 10 gm coffee contains how much mg of caffeine ??​

Answer 1

Answer:

If a 100gm coffee powder contains 40mg caffeine

so 40 ÷ 10 =4

so 10gm coffee powder contains 4mg caffeine

Answer 2

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Given:

100 gm coffee powder contain 40mg caffeine

To find:

10gm coffee contain how much mg of caffeine

Solution:

Let 10 gm coffee contain x gm of caffeine

100gm coffee powder contain 40mg caffeine

Therefore, 10gm coffee contain =

$\\ = \dfrac{10 \times 40}{100} \\ \\ = 4mg \: caffeine$

Thus, 10 mg coffee contain 4mg caffeine

Knowledge Booster:

1) Always solve such questions in the above use unitary method and solve more to get good hold

2) For example:

10 chocolates cost 10 Rs

1 chocolate cost x Rs

10 × x = 10 × 1

x = 10 × 1/10 = Rs 1

Do, it by this cross over way

3) For example:

6g tea powder in 1 bottle

12 g tea powder in x bottles

6 × x = 12 × 1

x = 12/6

x = 2 bottles