Question

The cost of 2
1
_
2
kg of sweets is ₹ 255. What is the cost of 1kg sweets?

Answer 1

Answer:

Half kg => rs255

1kg => half kg × 2

=>255 × 2

=>510

Answer will be rs 510.

Hope it helps you.

Answer by PURVESH

Answer 2

Answer:

The cost of 1 kg sweets is 102 rupees.

Step-by-step explanation:

Given cost of

$2 \frac{1}{2} \: kg$ of sweets is 255 rupees.

$2 \frac{1}{2} \: kg \\ = \frac{2 \times 2 + 1}{2} \: kg \\ = \frac{4 + 1}{2} \: kg \\ = \frac{5}{2} \: kg$

Therefore cost of $\frac{5}{2} \: kg$ sweets is 255 rupees.

By Unitary method,

Cost of 1 kg sweets is

$\frac{255}{ \frac{5}{2} } \\ = 255 \times \frac{2}{5} \\ = 51 \times 2 \\ = 102 \: rupees$

This is a problem of Algebra.

Some important Algebra formulas.

(a + b)² = a² + 2ab + b²

(a − b)² = a² − 2ab − b²

(a + b)³ = a³ + 3a²b + 3ab² + b³

(a - b)³ = a³ - 3a²b + 3ab² - b³

a³ + b³ = (a + b)³ − 3ab(a + b)

a³ - b³ = (a -b)³ + 3ab(a - b)

a² − b² = (a + b)(a − b)

a² + b² = (a + b)² − 2ab

a² + b² = (a − b)² + 2ab

a³ − b³ = (a − b)(a² + ab + b²)

a³ + b³ = (a + b)(a² − ab + b²)

Know more about Algebra,

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

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