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primary 6 | Maths
| Fractions
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(7) N → ($88.40-$18.40)÷2 = $35
(3) F → $35+$18.40 = $53.40
1 part N → $35÷7 = $5
1 part N → $53.40÷3 = $17.80
diff → $17.80-$5 = $12.80
$12.80÷$3.20 = 4
$17.80÷4 = $4.45 (Ans)
Check
$F + $N
= 3×4×$4.45
+ 7×4×($4.45-$3.20)
= $88.40 ✓
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