141 By selling 45 apples for ₹ 40, a person loses 20%. How many apples he should sell for ₹ 24 to gain 20% in the transaction ?

(A) 18

(B) 16

(C) 14

(D) 12

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142. A man spends 80% of his income. His income is increased by 20% and he increases his expenditure by 10%. His savings are increased by –

(A) 60%

(B) 32%

(C) 30%

(D) 20%

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143. The algebraic sum of the deviations of a set of n values from their mean is –

(A) n+1

(B) n

(C) n-1

(D) 0

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144. The arithmetic mean of the following data is –

17; 41, 19, 45, 32, 19, 25, 22, 13, 32.

(A) 24.3

(B) 26.8

(C) 26.5

(D) 32

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145. The factors of (x^{4} +9) are –

(A) (x^{2} +3x+3)(x^{2} -3x+3)

(B) (x^{2} +√6x+3)(x^{2} – √6x+3)

(C) (x^{2} +3)(x^{2} -3)

(D) (x^{2} +3)^{2}

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146. If one root of equation 5x^{2} +13x+k = 0 is reciprocal of the other root, then the value of k is –

(A) 5

(B) 2

(C) 1

(D) 0

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147. There are 2000 mice living in a field. If 1000 mice are born each month and 200 mice die each month, what is the percentage growth rate of mice over a month ?

(A) 10

(B) 30

(C) 40

(D) 20

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148 Solution of the equation

| 4x +17 13x-2 | 18 17x-32 is .

(A) x=-1/4

(B) x = 1/4

(C) x = 4

(D) x= -4

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149. it D(- ½, 5/2), E(7,3) and F(7/2, 7/2) are the coordinates of the mid-points of sides BC, CA and AB respectively of ΔABC, then the coordinates of the vertex C is –

(A) (4, 11)

(B) (3, 2)

(C) (-4, 3)

(D) (11, 4)

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150. n-coplanar straight lines meet at a point. The angles between consecutive lines are – x°, 2x°,…..nx°. The value of n in order that the minimum angle be 24°, is –

(A) 6

(B) 5

(C) 4

(D) 3

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