**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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