Question 699974
 a boy weighs 56.7kg. If he reduces his weight in the ratio 7:6,
 find his new weight. 
:
Follow the procedure and you will see why.
:
Let x = the new weight. 
write it as a ratio equation
Old weight is to new weight; {{{56.7/x}}} = {{{7/6}}}
Cross multiply
7x = 56.7 * 6
7x = 340.2
x = {{{340.2/7}}}
x = 48.6