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Identify difference between tables and chairs did not change because same no. of tables and chairs are added. Make their difference before and after 2u (only after detailing basic info in table below).

  Chairs Tables Total
At first ratio 2         (#4a. 4u) 1         (#4b.  2u) 1 (#2. make 2u)
Change no. +147  (#5a. Deduce +3u) +147  (#5a. +3u)  
End ratio 7         (#3a. 7u) 5         (#3b. 5u) 2 (#1. keep 2u)
    (Q: end no.?) Follow steps#

3u —> 147

1u —> 49

Tables at the end is 5u —> 245#

0 Replies 3 Likes ✔Accepted Answer

chairs :
2u + 147 ——– 7p

tables :
1u + 147 ——- 5p
2u + 294 ——- 10p

10p – 7p = 3p ——- 294 – 147 = 147
1p ——- 147/3 = 49
5p ——- 49 x 5 = 245

Ans : 245 tables.

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