Question

how to do first question

Answer 1

Let the number be x.
Four fifth of number = 4/5x
Three fourth of number = 3/4x

According to question =
4/5 x - 3/4 x = 4
(Take LCM )
(16x-15x) /20 = 4
x/20 = 4
x = 4×20
x = 80

So the number is 80.

If u satisfied mark it brainliest.

Answer 2

$hi...$
Let the number be x.

By the given condition

$\frac{4}{5} x = \frac{3}{4} x + 4$

$\frac{4}{5} x - \frac{3}{5}x = 4$

$( \frac{4}{5} - \frac{3}{4} )x = 4$

$( \frac{16}{20} - \frac{15}{20} )x = 4.......(l.c.m)$

$( \frac{16 - 15}{20} )x = 4$

$\frac{1}{20} x = 4$
$x = 20 \times 4$
$x = 80$
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Therefore ,
The number is 80.
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$hope \: \: this \: \: helps..$