PSC MATHS PREVIOUS QUESTIONS

1.At what rate percent per annum,in simple interest ,will Rs .800 to Rs 1000 in two years?
A)25
B)12.5
C)17.5
D)15

Interest=Amount-Principal = 1000-800=200.
I = PNR/100; 200=800𝗑2𝗑R/100
R=200𝗑100/800𝗑2=12.5
Answer 12.5

2.The area of the largest triangle that can be inscribed semicircle of 5 cm radius will be?
A)25 sq cm
B)125 sq cm
C)50 sq cm
D)100 sq cm

The area of the largest triangle inscribed in a semicircle of radius r is r square

So Area of the triangle =52 =25
Answer=25


3.Ahamed's age at present is equal to the total ages of his four children.After 20 years his age will be only one half of their total ages.How old is Ahamed?
A)25
B)30
C)35
D)40

Let A =present age of Ahamed and C=total of present ages of four children.

So A =C

After 20 years, Ahamed's age will be A+ 20 and the total age of four children will be C +20x4=C+80.

Then A + 20-1/2 [C +80];

2 (A+20)=C+80
2(A + 20) =A+80 [ C=A];
2A+40= A + 80;
2A-A=80-40; A=40

Answer:40
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