A direct proportion calculation
Now let us see a
calculation related to ratio
If 12 candies cost is
Rs.30. What is the cost of 48 candies?
How do you answer this
question?
You mean you can find
the cost of 1 candy divided by the cost of 12 candies and multiply that to get
the cost of 48 candies?
But look, the answer is
much easier if we use direct proportion here!
What do you mean by
proportionality?
As the number of
candies increases, so does its price! So is it direct proportional?
Isn't the ratio system
for direct ratio fractional? That is, quantity / price will be up to this
calculation.
Accordingly, the price
of 12 candies is Rs.30. Shouldn't be set to 12 / 30!
Next we need to see the
price of 48 candies. If its price is taken as x, then the ratio should be taken
as 48 / x!
Equalize the two ratios
and cross multiply. Here we go.
12 / 30 = 48 / x
12x = 30 × 48
12x = 1440
x = 1440 / 12
x = 120
So the cost of 48
candies is Rs. 120.
Did you see how we
found out? Get used to many more such calculations and you will be able to
answer them in a few seconds.
Next you are asked to
show me a calculation of the inverse proportion. Let's do and show you what it
is.
*****
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