7 1/2 - 1 1/4 = 7 2/4 - 1 1/4 = 6 1/4
Answer:

Step-by-step explanation:
If the third multiple of the whole number is
. This means that
is completely divisible by the number
.

So, the whole number is
.
The fifth multiple would mean the product of
and 

The fifth multiple of the whole number is
.
Answer:
k = 11
Step-by-step explanation:
k/90 - 1/9 = 1/90
k/90 = 1/90 + 1/9
k/90 = 1 + 10/90
k/90 = 11/90
k = 11/90 / 90
k = 11/90 * 90
k = 11
Answer:
mary=10 jack=15
Step-by-step explanation:
After 4 years Mary (x+4), Jack's age (x+5) + 4.
sum of the ages after 4 years :(x+4) + (x+5) +4=33
Simplifying the equation:
2x+13 = 33 ----->> 2x=20----->>>>x = 10 Mary's age
10 + 5 = 15 which is Jack's age.