Question

1. If5:x:: 13 : 39, find x
2. If a : b= 3:5, find (2a + 3b): (4a + 5b)
3. Find 15%of Rs. 250.
4. What percentage of 1 kg is 16 g?
5. If 90 is increased by 10%, then find the increased amount.
6. In a test, 90% of the students passed and 4 students failed. How many
students passed for the test?
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Answer 1

Answer:

1-15

2-21:37

3-37.5

4-1.6

5-99

6-36

Step-by-step explanation:

#1- 5:x::13:39

5/x=13/39

5/x=1/3

5=x/3

x=5*3

x=15

#2-a:b=3:5

let x be the common multiple

a=3x. b=5x

(2a+3b):(4a+5b)

(2*3x+3*5x):(4*3x+5*5x)

(6x+15x):(12x+25x)

21x:37x

21:37

#3-15%*250

15/100*250

15*250/100

3750/100

37.5

#4-let x% of 1kg be 16g

1kg*x/100=16g

1000g*x/100=16g

10x=16

x=16/10

x=1.6

#5-10%of90=10/100*90=9

9 is increased

90+9=99

thus, 7the New no. is 99

#6-90%won

10%can't win

let x be total students

10%*x=4

10x/100=4

x/10=4

x=4*10

x=40

students passed=90%of total students

=90*40/100

9*4

36

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