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Jim + Ting = 2 units
Olivia = 3 units
Jim + Ting + Olivia = 5 units

5 units = 155
1 unit = 155 ÷ 5
= 31
2 units = 31 × 2
= 62

Jim + Ting = 62 pencils

Since Jim had 22 more more pencils than Ting:
Ting’s pencils = (62 – 22) ÷ 2
= 40 ÷ 2
= 20

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