Answer :

Certainly! Let's work through each question step by step:

Q2. Four-fifths of a number is greater than three-fourths of a number by 8. Find the number.

1. Let's denote the unknown number as [tex]\( x \)[/tex].

2. According to the problem, four-fifths of the number ([tex]\( \frac{4}{5}x \)[/tex]) is greater than three-fourths of the number ([tex]\( \frac{3}{4}x \)[/tex]) by 8. Therefore, we can write the equation:
[tex]\[ \frac{4}{5}x = \frac{3}{4}x + 8 \][/tex]

3. To solve for [tex]\( x \)[/tex], first get all the [tex]\( x \)[/tex]-terms on one side of the equation. Subtract [tex]\( \frac{3}{4}x \)[/tex] from both sides:
[tex]\[ \frac{4}{5}x - \frac{3}{4}x = 8 \][/tex]

4. To subtract these fractions, find a common denominator. The common denominator for 5 and 4 is 20:
[tex]\[ \frac{16}{20}x - \frac{15}{20}x = 8 \][/tex]

5. Simplify the left side of the equation:
[tex]\[ \frac{1}{20}x = 8 \][/tex]

6. Multiply both sides by 20 to solve for [tex]\( x \)[/tex]:
[tex]\[ x = 8 \times 20 \][/tex]
[tex]\[ x = 160 \][/tex]

Therefore, the number is 160.


Q3. Ten added to thrice a whole number gives 40. Find the number.

1. Let's denote the unknown number as [tex]\( y \)[/tex].

2. According to the problem, ten added to three times the number ([tex]\( 3y \)[/tex]) equals 40. Therefore, we can write the equation:
[tex]\[ 3y + 10 = 40 \][/tex]

3. To solve for [tex]\( y \)[/tex], first subtract 10 from both sides of the equation:
[tex]\[ 3y = 40 - 10 \][/tex]
[tex]\[ 3y = 30 \][/tex]

4. Divide both sides by 3 to isolate [tex]\( y \)[/tex]:
[tex]\[ y = \frac{30}{3} \][/tex]
[tex]\[ y = 10 \][/tex]

Therefore, the number is 10.