Question

10.The difference between two fifth and
two quarters of a number is 7. What is the
number *
80
100
-90
-70
11.Which of these is a scalene triangle ? *​

Answer 1

Question:

The difference between two-fifth and two-quarters of a number is 7. What is the number?

Answer:

$\orange{ let \: the \: number \: be \: x} \\ \huge{according \: to} \\ \huge{the \: problem} \\ \frac{2x}{5} - \frac{2x}{4} = 7 \\ = > \: \frac{8x - 10x}{20} = 7 \\ = > \: \frac{ - 2x}{20} = 7 \\ = > \: \frac{ - 1x}{10} = 7 \\ = > \: x = 7 \times - 10 \\ = > \: x = - 70 \\ \\ so \: the \: correct \: answer \: is$

-70