( 170 + 50) ÷ 3.99 + ? = 149.99 ÷ 2.99
a) 19
b) 10
c) 16
d) 17
e) 45
Sol:
( 170 + 50) ÷ 3.99 + ? = 149.99 ÷ 2.99
( 169 + 49) ÷ 4 + ? = 150 ÷ 3
(13 + 7) ÷ 4 + ? = 50
20 ÷ 4 + ? = 50
? = 50 – 5
? = 45
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