Question

100- [36+ 6 x 9- ( a: 3 + 15)] :3= 77​

Answer 1

100-[36+6x9-(a:3+15)]:3=76

[36+6x9-(a:3+15)]:3=100-76

[36+6x9-(a:3+15)]:3=24

[36+6x9-(a:3+15)]=24x3

[36+6x9-(a:3+15)]=72

[36+54-(a:3+15)]=72

[90-(a:3+15)]=72

(a:3+15)=90-72

(a:3+15)=18

a:3=18-15

a:3=3

a=3x3

a=9