Question

If 15 oranges cost Rs.70, what is the cost of 39 oranges?

Answer 1

Hint: In this problem, we have to find the cost of 39 oranges, if 15 oranges cost Rs.70. We should first find the cost of one orange by dividing the given cost and the number of oranges. We will get the cost of one orange, we can then multiply it to 39, to get the cost of 39 oranges. We can now solve and find the cost of 39 oranges.

Complete step by step answer:
Here we are given that 15 oranges cost Rs.70.
We have to find the cost of 39 oranges.
We can now assume x as the cost of one orange.
We can now find the cost of one orange from the given condition that 15 oranges cost 70 rupees, we can write it as,
\[\Rightarrow 15x=70\]
We can now divide 15 on both sides, we get
\[\Rightarrow x=\dfrac{70}{15}=\dfrac{14}{3}\]
The cost of each orange is \[\dfrac{14}{3}\].
We can now find the cost of 39 oranges by multiplying the cost of each oranges to 39, we get
\[\Rightarrow 39\times \dfrac{14}{3}=13\times 14=182\]
Therefore, the cost of 39 oranges is Rs.182.

Note: We should always remember that, to find the cost of one thing from the given number of things and cost, we can divide them. If we have one thing’s cost and we have to find the cost of a given number of things, then we can multiply the cost of one thing’s cost and the given number of things.