Question

the cost of 60 envelopes is ₹90 then how many envelopes can be purchased for ₹120​

Answer 1

$\sf{\huge{\underline{\green{Given :-}}}}$

• The cost of 60 envelopes is ₹90 .

$\sf{\huge{\underline{\green{To\:Find :-}}}}$

• The envelopes can be purchased for ₹120.

$\sf{\huge{\underline{\green{Answer :-}}}}$

According to the question,

The cost of 60 envelopes is ₹90 .

Using the unitary method,

Rs. 90 is the cost of 60 envelope.

Rs. 1 is the cost of $\dfrac{\cancel{60}{90}}$

So, Rs. 1 is the cost of $\dfrac{\cancel{2}{3}}}$

So, Rs. 120 is the cost of $\dfrac{2}{3}}$ × 120

➝ 2 × 40

➝ 80

So, 80 envelope cost of rs 120 .

Answer 2

Question :-

The cost of 60 envelopes is ₹90 then how many envelopes can be purchased for ₹120

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Solution :-

➲ Given Information :-

• The cost of 60 envelopes ➢ ₹90

➲ To Find :-

• Number of envelopes that can be purchased for ₹120

➲ Concept Implied:-

Unitary Method.

➲ Explanation :-

Since the cost of 60 envelops is given as ₹90, cost of 1 envelope would be $\bf{ \dfrac{60}{90} }$. And. using this, we will find the number of envelops purchased with ₹120.

➲ Calculation :-

∵ The cost of 60 envelopes is ₹90

Using the unitary method,

∵ ₹90 is the cost of 60 envelope

⇒ ₹1 is the cost of ( $\sf{\dfrac{60}{90}}$ ) envelopes

Calculating further, We get,

⇒ ₹1 is the cost of ( $\sf{\dfrac{2}{3}}$ ) envelopes

⇒ ₹120 is the cost of ( $\sf{\dfrac{2}{3}× 120}$ ) envelopes

Cancelling & Calculating further, We get,

⇒ ( 2 × 40 ) envelopes

⇒ 80 envelopes

∴ 80 envelops can be purchased with ₹120

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Final Answer :-

• 80 envelops can be purchased with ₹120

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