Half liter oil costs rupees 45 then find out the cost of 312 liter oil-

Cost of 1/2 l oil = Rs. 45 ∴ cost of 1 l oil = 45/1/2 #160; = Rs. 45× 2 = Rs. 90 ∴ cost of 31/2 = 7/2 l oil #160; = R ...

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Standard VII

Mathematics

Solving an Equation

Half liter oi...

Question

Half liter oil costs rupees 45 then find out the cost of $3 \frac{1}{2}$ liter oil?

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Solution

Cost of $\frac{1}{2}$ l oil = Rs. 45
$∴$ cost of 1 l oil = $\frac{45}{\frac{1}{2}}$ = Rs. $45 \times 2$
$= R s . 90$
$∴$ cost of $3 \frac{1}{2} = \frac{7}{2}$ l oil = Rs. $\frac{90}{\frac{7}{2}}$ = Rs. $\frac{90 \times 2}{7} = R s . \frac{180}{7}$
$= R s . = 25.7$

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Half liter oil costs rupees 45 then find out the cost of 312 liter oil?

Cost of 12 l oil = Rs. 45∴ cost of 1 l oil = 4512 = Rs. 45×2=Rs.90∴ cost of 312=72 l oil = Rs.9072 = Rs. 90×27=Rs.1807=Rs.=25.7

Half liter oil costs rupees 45 then find out the cost of $3 \frac{1}{2}$ liter oil?

Cost of $\frac{1}{2}$ l oil = Rs. 45
$∴$ cost of 1 l oil = $\frac{45}{\frac{1}{2}}$ = Rs. $45 \times 2$
$= R s . 90$
$∴$ cost of $3 \frac{1}{2} = \frac{7}{2}$ l oil = Rs. $\frac{90}{\frac{7}{2}}$ = Rs. $\frac{90 \times 2}{7} = R s . \frac{180}{7}$
$= R s . = 25.7$