Question

Twice the sum of the number and 10 is 60 what is the number?​

Answer 1

Let the number be n

$\\ \sf\longmapsto 2(n+10)=60$

$\\ \sf\longmapsto n+10=60/2$

$\\ \sf\longmapsto n+10=30$

$\\ \sf\longmapsto n=30-10$

$\\ \sf\longmapsto n=20$