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Unitary Method — MATHS STD 7 — Question

Gujarat BoardEnglish MediumSTD 7MATHSUnitary Method2 Marks
Question
If $15$ oranges cost $Rs. 110,$ what do $39$ oranges cost$?$
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Answer

Cost of $15$ oranges $= Rs. 110$
Cost of $1$ orange $=\text{Rs.}\ \frac{110}{15}$ And
cost of $39$ oranges $=\text{Rs.}\ \frac{110}{15}\times39$
$= Rs. 22 \times 13 = Rs. 286$

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