Maths is 10 equal units. English is 7⁄10 of Maths, so 7 of those units = 63 marks.

Maths9999999999English999999963

Plain numbers are given; italic underlined numbers are worked out.

  1. English = 7 units → 63
  2. 1 unit → 63 ÷ 7 = 9
  3. Maths = 10 units → 10 × 9 = 90

She scored 90 marks for Maths.

Check: 7⁄10 of 90 = 63 = English. ✓