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3)Simplify and evaluate the expressions:
a) A number exceeds its three fifth by 22, find the number.


Sagot :

To solve the problem where a number exceeds its three-fifths by 22, let's define the unknown number as [tex]\( x \)[/tex].

1. According to the problem, the equation can be set up as:
[tex]\[ x = \frac{3}{5}x + 22 \][/tex]

2. To isolate [tex]\( x \)[/tex], subtract [tex]\(\frac{3}{5}x\)[/tex] from both sides of the equation:
[tex]\[ x - \frac{3}{5}x = 22 \][/tex]

3. Combine the terms on the left side. [tex]\( x \)[/tex] is the same as [tex]\(\frac{5}{5}x\)[/tex]:
[tex]\[ \frac{5}{5}x - \frac{3}{5}x = 22 \][/tex]

4. Subtract the fractions:
[tex]\[ \frac{2}{5}x = 22 \][/tex]

5. To solve for [tex]\( x \)[/tex], multiply both sides by the reciprocal of [tex]\(\frac{2}{5}\)[/tex], which is [tex]\(\frac{5}{2}\)[/tex]:
[tex]\[ x = 22 \times \frac{5}{2} \][/tex]

6. Calculate the right side:
[tex]\[ x = 55 \][/tex]

Therefore, the number is [tex]\( 55 \)[/tex].