Question

70% of what number is 84​

Answer 1

Step-by-step explanation:

➡let this number is x .

➡So,

a/c to questions.

♠70% of x = 84.

=> 70 * X /100= 84.

=> X = 84 * 100/70.

=> X = 120.

➡Hopes its helps u

Answer 2

Answer:

Required value of the number is 120.

Step-by-step explanation:

Given,

70% of any number is 84

Here we want to find value of the number.

Let the number be x.

We know

$a\% \: of \: b = \frac{a}{100} \times b$

So according to question,

$70\% \: of \: x = 84 \\ \frac{70}{100} \times x = 84 \\ x = 84 \times \frac{100}{70} \\ x = 12 \times 10 \\ x = 120$

This is a problem of Algebra.

Some important Algebra formulas:

${(x + y)}^{2} = {x}^{2} + 2xy + {y}^{2} \\ {(x - y)}^{2} = {x}^{2} - 2xy + {y}^{2} \\ {(x + y)}^{3} = {x}^{3} + 3 {x}^{2} y + 3x {y}^{2} + {y}^{3} \\ {(x - y)}^{3} = {x}^{3} - 3 {x}^{2} y + 3x {y}^{2} - {y}^{3} \\ {x}^{3} + {y}^{3} = {(x + y)}^{3} - 3xy(x + y) \\ {x}^{3} - {y}^{3} = {(x - y)}^{3} + 3xy(x - y) \\ {x}^{2} - {y}^{2} = (x + y)(x - y) \\ {x}^{2} + {y}^{2} = {(x - y)}^{2} + 2xy \\ {x}^{2} - {y}^{2} = {(x + y)}^{2} - 2xy \\ {x}^{3} - {y}^{3} = (x - y)( {x}^{2} + xy + {y}^{2} ) \\ {x}^{3} + {y}^{3} = (x - + y)( {x}^{2} - xy + {y}^{2} )$

Know more about Algebra,

1) https://brainly.in/question/13024124

2) https://brainly.in/question/1169549

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