Cody had
19 as many marbles as George. George had thrice as many marbles as Sam. If Cody had 90 marbles fewer than Sam,
- how many marbles did Cody have?
- how many marbles did they have altogether?
(a)
Number of marbles that Cody had = 1 u
Number of marbles that George had = 9 u
Number of marbles that Sam had = 9 u ÷ 3 = 3 u
Number of marbles that Cody had fewer than Sam
= 3 u - 1 u
= 2 u
2 u = 90
1 u = 90 ÷ 2 = 45
Number of marbles that Cody had
= 1 u
= 45
(b)
Total number of marbles that they had
= 1 u + 9 u + 3 u
= 13 u
= 13 x 45
= 585
Answer(s): (a) 45; (b) 585
