I know the answer of this sum but would be glad to get an explanation to how this is done:
Box P has 5 more pencils than Box Q. How many pencils must be moved from Box P to Box Q, such that Box P has 9 fewer pencils than Box Q now?
a) 4
b) 5
c) 6
d) 7
Hello, MoniMini!
Box P has 5 more pencils than Box Q.
How many pencils must be moved from Box P to Box Q,
so that Box P has 9 fewer pencils than Box Q now?
. . a) 4 . . b) 5 . . c) 6 . . d) 7
Let = number of pencils in Box Q.
Then there are pencils in Box P.
Suppose pencils are moved from Box P to Box Q.
. . Then Box P will have: pencils. .[1]
. . And Box Q will have: pencils. .[2]
We want [1] to be 9 less than [2].
. . . .
Got it?