Practice Simple percentage - quantitative aptitude Online Quiz (set-1) For All Competitive Exams
Q-1) 2 is what percent of 50?
(a)
(b)
(c)
(d)
Let 2 be x% of 50
x% of 50 = 2
$x/100$× 50 = 2⇒ $x/2$ = 2
x = 4
Q-2) If 120% of a is equal to 80% of b, then $\text"b + a"/ \text"b - a"$ is equal to
(a)
(b)
(c)
(d)
a × $120/100 = b × 80/100$
$b/a = 120/80 = 3/2$
${b + a}/{b - a} = {b/a + 1}/{b/a - 1} = {3/2 + 1}/{3/2 - 1} = {5/2}/{1/2} = 5$
Q-3) If 50 % of P = 25% of Q, then P = x% of Q. Find x.
(a)
(b)
(c)
(d)
P × $50/100 = Q × 25/100$
P × 50 = Q × 25
P = ${Q × 25}/50 ⇒ P = Q/2$
P = Q x %
Q × $x/100 =Q/2$
x = $100/2$ = 50
Q-4) What is 20% of 25% of 300?
(a)
(b)
(c)
(d)
20% of 25% of 300 =$20/100 × 25/100 × 300$
= $1/5 × 1/4 × 300$= 15
Q-5) If three-fifth of sixty per cent of a number is 36, the number is
(a)
(b)
(c)
(d)
Let the number be x.
$3/5 × 60/100 × x = 36$
$x = {36 × 5 × 5}/{3 × 3}$ = 100
Q-6) If 50% of (P – Q) = 30% of (P + Q) and Q = x% of P, then the value of x is :
(a)
(b)
(c)
(d)
${P – Q}/2 = (P + Q) × 30/100$
5(P - Q) = (P + Q) × 3
5P - 3P = 5Q + 3Q
2P = 8Q
P = 4Q = 4 × ${P × x}/100$
${4x}/100$= 1 ⇒ x = 25
Q-7) What is to be added to 15% of 160 so that the sum may be equal to 25% of 240 ?
(a)
(b)
(c)
(d)
Required number = ${240 × 25}/100 - {160 × 15}/100$
= 60 – 24 = 36
Q-8) If p% of p is 36, then p is equal to :
(a)
(b)
(c)
(d)
p% of p = 36
$p/100$× p = 36
$p^2$ = 3600
p = 60
Q-9) Out of two numbers, 40% of the greater number is equal to 60% of the smaller. If the sum of the numbers is 150, then the greater number is
(a)
(b)
(c)
(d)
Let greater number be x.
Smaller number = 150 - x
According to the question,
${40 ×x}/100 = {60(150 - x)}/100$
2x = 3 × 150 - 3x
5x = 3 × 150
x = 90
Q-10) What percent of 3.5 kg is 70 gms ?
(a)
(b)
(c)
(d)
Required percentage = $70/{3.5 × 1000} × 100$ = 2%