Question

Help please!
And thank u

Answer 1

`(a)/(7) + (a)/(3) = 10 \\ ((3a + 7a))/(21) = 10 \\ (10a)/(21) = 10 \\ a = ((10 * 21))/(10) \\ \boxed{a = 21}`

a=21 is the right answer.

Answer 2

a/7 + a/3 = 10
a = 21