Question

I need help with this math problem

Answer 1

The blank is 7

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Let the missing number be n.

Given equation:

• (3 × 5) + (6 × 5) = (16 × 5) - (n × 5)

Option 1

All terms have ×5, so we can cancel it. Then we get:

• 3 + 6 = 16 - n
• 9 = 16 - n
• n = 16 - 9
• n = 7

Option 2

Solve it in below steps:

• (3 × 5) + (6 × 5) = (16 × 5) - (n × 5)
• (3 + 6) × 5 = (16 - n) × 5
• 9 × 5 = (16 - n) × 5
• 9 = 16 - n
• n = 7

Option 3

Simplify by calculation:

• (3 × 5) + (6 × 5) = (16 × 5) - (n × 5)
• 15 + 30 = 80 - 5n
• 45 = 80 - 5n
• 5n = 80 - 45
• 5n = 35
• n = 7