I’ve realised it’s more of a mental challenge (then) a physical one.
‘Then’ indicates time while ‘than’ is used in comparisons as a conjunction. Hence, in this sentence, ‘than’ is the correct alternative (as the comparison between mental and physical health is shown).
4.7 × 3.5 + 4.2 × 4.5 = 22.5 × 3.5 - ?
8(3/4) + 5(1/6) – 4(3/4) = ?
2/5 of 3/4 of 7/9 of 7200 = ?
(√196 + √121) × 4 = ?/2
(25)² × 4 ÷ 5 + (3)³ + 48=? + 425
(60 × 8 ÷ 10) × 5 = ?
(360 - ?)/(25% of 96) = 13
779 + 136 – 334 = 270 + 121 + ?
2856 ÷ 34 = ?% of 240
(22.5 × 24) ÷ 40 + 51.50 = ? ÷ 5.25