Question

4 पयाले चाय तथा 7 प्याले कॉफ़ी का मूल्य 135 रूपए है।एक कप कॉफ़ी का मूल्य चाय के दो कप कॉफ़ी से दुगुना है तो 2 कप चाय और एक कप कॉफ़ी का मूल्य ज्ञात कीजिए​

Answer 1

Answer:

let the cost of one cup of tea is x

and one cup of coffee is y

4x+7y=135 ...equation (1)

A.T.P

the cost of one cup of coffee = twice the cost of two cups of tea

y=2×2x

y=4x ....equation(2)

putting the valu of y in equation (1)

4x+7(4x)=135

4x+28x=135

32x=135

x=135/32

x=4.21875

putting the value of in equation (2)

y=4×4.21875

y=16.875

the cost of one cup of tea =4.21875

the cost of two cups of tea =2×4.21875=8.4375

the cost of two cups of tea =2×4.21875=8.4375the cost of one cup of coffee=16.875