Question

Please help this is for my son

Answer 1

Total cookies both baked

`\\ \tt\longmapsto (1)/(3)+(2)/(5)`

`\\ \tt\longmapsto (5+6)/(15)=(11)/(15)`

Cookies left:-

`\\ \tt\longmapsto 30-11/15(30)=30-22=8`

Answer 2

8 cookies left to be baked

Explanation:

Len

Len bakes 1/3 of 30 cookies

To find 1/3 of 30, divide 30 by 3 then multiply by 1:

`\implies (30)/(3) *1=10 * 1=10`

Therefore, Len bakes 10 cookies

Sallesh

Sallesh bakes 2/5 of 30 cookies

To find 2/5 of 30, divide 30 by 5 then multiply by 2:

`\implies (30)/(5) *2=6 * 2=12`

Therefore, Sallesh bakes 12 cookies

Cookies left to bake

To calculate how many cookies are left to bake, subtract the found number of cookies Len and Sallesh have baked from 30:

30 - 10 - 12 = 8

So there are 8 cookies left to be baked.