Question

If the ratio of two pulleys, A and B is 4:3, and pulley B has a length of 13.5 inches, how long is pulley A?

[a] inches

how do i figure this

Answer 1

do u know how to do cross-products? it is very easy. in this question, u simply have to find out what A equals, rite? this is how to do cross products

4:3 is really also a fraction
make 4:3 a fraction:4/3
then write wat u kno,
4/3= x/13.5 ( the "x" is a variable)
now wat u have to do is cross mulitiply
4*13.5= 3*x
4*13.5=54
54=3*x
now wat u want 2 do is leave the x by itself so u can figure out what its vale is(the value will be the lenght of pulley A)
54/3=x (i took the 3 out of"3*x" )
watever 54/3 is, that's the value of x, which is the length of pulley A
(once u get it down on paper, u'll probably understand)