16.
If 2 tables and 3 chairs cost Rs. 3500 and 3 tables and 2 chairs cost Rs. 4000, then how much does a table cost?
• A.
Rs. 500
• C.
Rs. 1000
• B.
Rs. 750
• D.
Rs. 1500
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Explanation :
 Let the cost of a table and that of a chair be Rs. x and Rs. y respectively. Then, 2x + 3y = 3500 (i) and 3x + 2y = 4000 .(ii) Solving (i) and (ii), we get : x = 1000 and y = 500.
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17.
 52.416 18.72 + 6.28 = ?
• A.
2.09664
• C.
9.08
• B.
8.36
• D.
9.80
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Explanation :

Given exp. =
 5241.6 1872
+ 6.28 = 2.8 + 6.28 = 9.08

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18.
 (856 + 167)2 + (856 - 167)2 856 x 856 + 167 x 167
= ?
• A.
1
• C.
689
• B.
2
• D.
1023
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Explanation :

Given exp. =
 (a + b)2 + (a - b)2 a2 + b2
, where a = 856, b = 167

=
 2(a2+ b2) (a2 + b2)
= 2.

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19.
The price of 10 chairs is equal to that of 4 tables. The price of 15 chairs and 2 tables together is Rs. 4000. The total price of 12 chairs and 3 tables is:
• A.
Rs. 3500
• C.
Rs. 3840
• B.
Rs. 3750
• D.
Rs. 3900
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Explanation :

Let the cost of a chair and that of a table be Rs. x and Rs. y respectively.

Then, 10x = 4y or y =
 5 2
x

15x + 2y = 4000

15x + 2 x
 5 2
x = 4000

20x = 4000

x = 200

So, y =
 5 2
x 200    = 500

Hence, cost of 12 chairs and 3 tables = 12x + 3y = Rs. (2400 + 1500) = Rs. 3900.

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20.
The taxi charges in a city comprise of a fixed charge, together with the charge of the distance covered. For a journey of 16 km, the charges paid are Rs. 156 and for a journey of 24 km, the charges paid are Rs. 204. What will a person have to pay for travelling a distance of 30 km?
• A.
Rs. 226
• C.
Rs. 248
• B.
Rs. 240
• D.
Rs. 252
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