Question 1:
Solve: -2/3×3/5+5/2-3/5×1/6
2/3×3/5+5/2-3/5×1/6
=2/5+5/2-1/10
=(2*2+5*5-1)/10
=(4+25-1)/10
=28/10
=14/5
Question 2:
Solve the equation: 15/4 – 7x =9
15/4 – 7x =9
Or, (15 – 28x)/4 =9
Or, 15 – 28x=9*4
Or, 15 – 28x =36
Or, -28x=36-15
Or, -28x=21
Or, x=-21/28=-3/4
Question 3:
Two numbers are in the ratio 5:3. If they differ by 18, what are the numbers?
Let numbers are 5x and 3x respectively.
5x-3x=18
2x=18
X=18/2=9
Numbers are=5x, 3x=45, 27
Question 4:
Write 815642120 in words (in the International system).
815642120
= 815,642,120
= eight hundred fifteen million six hundred forty-two thousand one hundred twenty
Question 5:
Find x in 2x+5÷3=3x-10
2x+5÷3=3x-10
Or, 5÷3=3x-2x-10
Or, 5÷3=x-10
Or, 5÷3+10=x
Or, 5/3 + 10 =x
Or, x=(50+30)/30
Or, x=80/30
Or, x=8/3
Question 6:
What is the lowest term in 64/32?
64/32
=2/1
lowest term in 64/32=2/1
Question 7:
Are 4/6 and 8/12 equal ?
8/12
=4/6
So, 4/6 and 8/12 are equal.
Question 8:
One-fifth of a number is 9. Find the number
Let number=x
ATQ,
(1/5)x=9
Or, x/5=9
Or, x=9*5
Or, x=45
Question 9:
What should be added to 1/4 to get 4/9?
Let x should be the required number.
ATQ,
(1/4)+x=4/9
Or, (1+4x)/4=4/9
Or, (1+4x)=16/9
Or, 4x=16/9-1
Or, 4x=(16-9)/9
Or, 4x=7/9
Or, x=7/36
Question 10:
Fine the value of x when (5x-4) =0
(5x-4) =0
Or, 5x =4
Or, x=4/5
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