Ben and Caleb read a total of 60 books in November. In December, Ben read 18 fewer books than Caleb who read thrice as many books as he did in November. If both of them read a total of 90 books in December, how many books did Ben read in Nov and Dec?
BN [ ] )
CN [ ] ) 60
BD [ ]<18> )
CD [ ][ ][ ] ) 90
6 u -- > 90 + 18 = 108
1 u -- > 108 ÷ 6 = 18
BD -- > 3 x 18 – 18 = 36
BN -- > 60 – 18 = 43
36 + 42 = 78 books
Ben read 78 books in Nov and Dec.
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