To solve for Y in the first equation:
Y / 42 = 15 / 21Cross multiply:21Y = 15 * 4221Y = 630Y = 630 / 21Y = 30
So, Y = 30.
To solve for Y in the second equation:
6.8 / Y = 0.4 / 0.13Cross multiply:0.4Y = 6.8 * 0.130.4Y = 0.884Y = 0.884 / 0.4Y = 2.21
So, Y = 2.21.
To solve for Y in the first equation:
Y / 42 = 15 / 21
Cross multiply:
21Y = 15 * 42
21Y = 630
Y = 630 / 21
Y = 30
So, Y = 30.
To solve for Y in the second equation:
6.8 / Y = 0.4 / 0.13
Cross multiply:
0.4Y = 6.8 * 0.13
0.4Y = 0.884
Y = 0.884 / 0.4
Y = 2.21
So, Y = 2.21.