Name : ____________________    Date   : _____________

                                                      Score : _____________

Answer the followings:

  1)  John had twice as many stickers as David. After John gave away 68 of his stickers and David gave away 23 of his stickers, each of them had the same no. of stickers left.   How many stickers did John have at first?
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

  2)  MR. Cai has three times as many twenty-cent coins as fifty-cent coins in his wallet.  If he has $8.80 in his wallet,  how many twenty-cent coins does MR. Cai have?
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Answers:

  1) 
At first :
 John ------ 2 units
 David ----- 1 unit

After
 John ------ 2 units - 68
 David ----- 1 unit - 23
 [2 units - 68] = [1 unit - 23]

1 unit ------- 68 - 23 = 45
 John ------- 2units x 45 = 90 (answer)
 

  2) 
Items  No of units    x     Value    Total value
20 cents    3u            x      0.2         0.6u
50 cents    1u            x      0.5         0.5u
Total                                              1.1u

1.1u = 8.80
   1u = 8

Number of 20 cents coins -> 3u 
                                         -> 3 x 8
                                         - 24 twenty cent coins

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