Question

the ratio of a monthly income to savings of a family is 7:2 . If the savings is rupees 500 , then find the monthly income.​

Answer 1

Answer:

here's your answer

Step-by-step explanation:

7:2=income:savings

let income be x

7:2=500:x

7x=500*2

7x=1000

x=1000/7

x=income=142.8571428571

hope it helps you

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Answer 2

Answer:

Answer:

\boxed{\mathfrak{Heat \ developed \ (H) = 15 \ kJ}}

Heat developed (H)=15 kJ

Given:

Resistance (R) = 20 Ω

Current (I) = 5 A

Time (t) = 0.5 min = 30 s

To Find:

Heat developed (H) in the electric iron

Explanation:

Formula:

\boxed{ \bold{ \sf H = I^2Rt}}

H=I

2

Rt

Substituting values of I, R & t in the equation:

\begin{gathered}\sf \implies H = {5}^{2} \times 20 \times 30 \\ \\ \sf \implies H = 25 \times 20 \times 30 \\ \\ \sf \implies H = 15000 \: J \\ \\ \sf \implies H = 15 \: kJ\end{gathered}

⟹H=5

2

×20×30

⟹H=25×20×30

⟹H=15000J

⟹H=15kJ