Problem Solving section 4 MCQ Practice Questions Answers Test with Solutions & More Shortcuts

Answer: (c)

If number of chocolates is NC then those of biscuits

$N_B = 2N_C$

and number of apples i.e $N_A > 3N_C$

also, total amount spent

= $2N_A + N_C + 1/4 (2N_B) = 2N_A + 2N_C$

(note that amount of money spent is even number)

option (b) 33 = 8 + 24 + 1

but 2$N_A$ ≠ 25

option (c) is not possible

So, option (a) 34 = 8+ 24 + 2

$↙{even}2N_A, [N_A > 3N_C also]↙{satisfied}$

So, option (c) is correct

Answer: (b)

Salary for 5th and 7th week = 2 × 7 × 20 × 6 = Rs 1680

Salary for 6th and 8th week = 2 × 3 × 10 × 6 = Rs 360

Salary for 2nd month = 1680 + 360 = Rs 2040

Similarly salary for 3rd month

= 2(6 × 20 × 6) + 2 ( 4 × 10 × 6)

= 1440 + 480 = Rs 1920

Salary for 4th month = 2(8 × 20 × 6) + 2 (0) = Rs 1920

Salary at the end of 4 months

= 1440 + 2040 + 1920 + 1920

= Rs 7320

∴ Average monthly salary = ${7320}/4$ = Rs 1830

Answer: (a)

Under new scheme salary for 9th and 11th week

= 2 (25 × 6 – 5 × 4 ) × 6 = Rs 1560

Now salary for 10th and 12th week = 2( 25 × 4 – 5 × 6 ) × 6

= Rs 840

Total salary for 3rd month = 1560 + 840 = Rs 2400

Under previous scheme total salary for 3rd month

= Rs 1920

Difference = 2400 – 1920 = Rs 480

Answer: (c)

Salary in the first week = Rs 20 per working hour

As the working pattern changes next week, so wage/hr for the 2nd and fourth week = ${20}/2$ = 10

Work and Rest hrs/day for the 2nd and 4th weeks respectively are 2 and 5 hrs.

A week consist of 6 days and a month of 4 week

Salary from 1st and 3rd week = 20 × 5 × 2 × 6 = Rs 1200

Salary for 2nd and 4th week = 2 × 10 × 6 × 2 = Rs 240

Salary for 1st month = 1200 + 240 = Rs 1440

Answer: (a)

According to conditions salary for first 3 months

= 1440 + 2040 + 2400 = Rs 5880

Salary for 4th month (13th to 16th week)

= 2(25 × 8 × 6) + 2(0 - 8 × 5 × 6) = 2400 – 480 = Rs 1920

Total salary for 16 weeks = 5880 + 1920 = Rs 7800