Question 1023779
Hi there,
Make the child's age = 'x'
In 10 ​years, a​ child's age will be 4 
years less than triple her current age.
x + 10 = 3x - 4
Collect like terms
x - 3x = - 4 - 10
-2x = - 14
x = 7
Child's current age is 7 yrs old.
Hope this helps :-)