The first ratio given for blue to green blocks is 4:1 which means that for every 1 green block, 4 blue blocks are used. So in the table, 16 blue blocks will be used with 4 green blocks so the ratio will be 16:4 which is the same as 4:1. In the second question, 7 green blocks will be used with 7*4 blue blocks,28 blue blocks so the ratio will be 28:7 same as 4:1
The first ratio given for blue to green blocks is 4:1 which means that for every 1 green block, 4 blue blocks are used. So in the table, 16 blue blocks will be used with 4 green blocks so the ratio will be 16:4 which is the same as 4:1. In the second question, 7 green blocks will be used with 7*4 blue blocks,28 blue blocks so the ratio will be 28:7 same as 4:1