Question 1148844
The ratio of Mona's savings to Timmy's savings is 4:7.
 If Mona has PhP 640.00, how much money do they have altogether?
: 
let t = T's savings
{{{640/t}}} + {{{4/7}}}
cross multiply
4t = 640 * 7
4t = 4480
t = 4480/4
t = $1120 is T's savings
:
Check on calc: 
640/1120 = .571..
4/7 = .571..