Question Detail

If 16 toys cost 240, then what do 40 toys cost ?

Rs. 600
Rs. 620
Rs. 640
Rs. 660

Answer: Option C

Explanation:

Although we can first calculate the cost of one toy and then can multiply it with 40 to get the result.
but we will solve it with chain rule so that we can prepare ourself for other complex problems which we can solve easily by applying this rule.

Let the required cost be Rs. x
More toys means More Cost. (Direct Proportion)

\begin{aligned}
15:40 :: 240:x \\
=> x = \frac{240*40}{15} \\
=> x = 640
\end{aligned}

So 40 toys will cost Rs 640

1. If 16 toys cost 240, then what do 40 toys cost ?

Rs. 600
Rs. 620
Rs. 640
Rs. 660

Answer: Option C

Explanation:

2. 36 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work ?

24 days
28 days
34 days
35 days

Answer: Option A

Explanation:

Less Men, means more Days {Indirect Proportion}

Let the number of days be x
then,

27 : 36 :: 18 : x
[Please pay attention, we have written 27 : 36 rather than 36 : 27, in indirect proportion, if you get it then chain rule is clear to you :)]

\begin{aligned}
x = \frac{36*18}{27} \\
x = 24
\end{aligned}
So 24 days will be required to get work done by 27 men.

3. If the cost of x metres of wire is d rupees, then what is the cost of y metres of wire at the same rate ?

xd
yd
yd/x
x/yd

Answer: Option C

4. In a dairy farm, 40 cows eat 40 bags of husk in 40 days. In how many days one cow will eat one bag of husk ?

34 days
40 days
46 days
50 days

Answer: Option B

Explanation:

Less Cows, More days (Indirect Proportion)
Less bags, Less days (Direct Proportion)

\begin{aligned}
\begin{bmatrix}Cows & 1 & 40 \\Bags & 40 & 1 \end{bmatrix} :: 40 : x \\
=> x * 40 * 1= 40 * 1 * 40 \\
=> x = 40
\end{aligned}

5. If the price of 23 toys is 276, then what will the price of 12 toys ?

Answer: Option A

Explanation:

Less toys, Less Price (Direct Proportion)
So, let the price be Rs. x
then,
\begin{aligned}
23:12 :: 276:x
=> x = \frac{276*12}{23} \\
=> x = 144
\end{aligned}

So price of 12 toys will be Rs. 144

s 10 years ago

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Question Detail
If 16 toys cost 240, then what do 40 toys cost ?
Rs. 600
Rs. 620
Rs. 640
Rs. 660
Answer: Option C
Explanation:
Although we can first calculate the cost of one toy and then can multiply it with 40 to get the result.
but we will solve it with chain rule so that we can prepare ourself for
other complex problems which we can solve easily by applying this rule.
Let the required cost be Rs. x
More toys means More Cost. (Direct Proportion)
15:40::240:x=>x=240?4015=>x=640
your solution is incorrect
the correct answer is 600 calculate in prper way when question gives16 toy cost then how you will divide by 15
correct answer is:15:40::240:x=>x=240?40/16=>x=600
pravin c 11 years ago

For first question
Rs 240 for 16 toys so for 1 toy 240/16= 15
so for 40 toys 40*15 = 600.?
please confirm.
avinash 11 years ago

On first question you have given 16 toys cost 240 so 40 toys cost how much, but you have taken 15 toys cost is 240 so when we arrive at answer 600 according to question, you arrive at 640 please correct the question admin, there are some questions which have same mistakes in numbers, pls correct them admin bhai