MCQs Preparation

Twelve children take sixteen days to complete a work which can be completed by 8 adults in 12 days. After working for 3 days, sixteen adults left and six adults and four children joined them. How many days will they take to complete the remaining work ?

A. 3 days
B. 4 days
C. 6 days
D. 8 days

C. 6 days

12 children take 16 days to complete a work.

so,

1 child’s 1 day’s work=1/(12*16)

1 child’s 1 day’s work=1/192

8 adults take 12 days to complete a work.

So, 

1 adult’s day’s work=1/(8*12)

1 adults day’s work=1/96

But, after working of 3 days, 16 adults left

so, 

16 adults 3 day’s work= 16*3*1/96

16 adults 3 day’s work=1/2

therefore,

the remaining work will be:

Remaining work=1-1/2

Remaining work=1/2

Now (6 adults+ 4 Children) 1 day’s work will be:

(6 adults+4 children) 1 day’s work=6/96+4/192

(6 adults+4 children) 1 day’s work= 16/192

(6 adults+4 children) 1 day’s work=1/12

so,

1/12th of the work is done by them in 1 day

thus,

they take following days to complete the remaining work.

(1÷1/12)*1/2

(1*12)*1/2

12/2

6 days

 

Submitted by: Admin

Twelve children take sixteen days to complete a work which can be completed by 8 adults in 12 days. After working for 3 days, sixteen adults left and six adults and four children joined them. How many days will they take to complete the remaining work ? Read More »

A trader owes a merchant Rs. 10,028 due 1 year hence. The trader wants to settle the account after 3 months. If the rate of interest 12% per annum, how much cash should he pay?

A. Rs. 9025.20
B. Rs. 9200
C. Rs. 9600
D. Rs. 9560

B. Rs. 9200

Required money =P.W. of Rs.10028 due 9 months hence
= Rs (10028*100)/(100+(12*9/12))
= Rs.9200

A trader owes a merchant Rs. 10,028 due 1 year hence. The trader wants to settle the account after 3 months. If the rate of interest 12% per annum, how much cash should he pay? Read More »

A shopkeeper earns a profit of 10% after allowing a discount of 20% on the marked price. The cost price of the article whose marked price is Rs. 880, is =_______ ?

A. Rs. 704
B. Rs. 640
C. Rs. 774
D. Rs. 680

B. Rs. 640

Market price of the article = Rs.880

After discount selling price of the article

= (880*80)/100

= Rs. 704

Cost Price of the article

= (704*100)/110

= Rs. 640 (Answer)

A shopkeeper earns a profit of 10% after allowing a discount of 20% on the marked price. The cost price of the article whose marked price is Rs. 880, is =_______ ? Read More »

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